A1184LUA-T [ALLEGRO]
Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches; 标准的两线现场可编程稳定斩波型单极霍尔效应开关
| 型号： | A1184LUA-T |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches |
| 文件： | 总14页 (文件大小：317K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
A1184
Standard Two-Wire Field-Programmable Chopper-Stabilized
Unipolar Hall-Effect Switches
The A1184 device is a standard, two-wire, unipolar, Hall effect switches. The
operate point, BOP, can be field-programmed, after final packaging of the sensor
and placement into the application. This advanced feature allows the optimiza-
tion of the sensor switching performance, by effectively accounting for variations
Package LH, 3-pin SOT
3
caused by mounting tolerances for the device and the target magnet.
1. VCC
2. No connection
3. GND
This family of devices are produced on the Allegro MicroSystems advanced
BiCMOS wafer fabrication process, which implements a patented, high-frequency,
chopper-stabilization technique that achieves magnetic stability and eliminates
the offsets that are inherent in single-element devices exposed to harsh applica-
tion environments. Commonly found in a number of automotive applications, the
A1184 is utilized to sense: seat track position, seat belt buckle presence, hood/
trunk latching, and shift selector position.
NC
2
1
Package UA, 3-pin SIP
Two-wire unipolar switches are particularly advantageous in price-sensitive appli-
cations, because they require one less wire than the more traditional open-collec-
tor output switches. Additionally, the system designer gains inherent diagnostics
because output current normally flows in either of two narrowly-specified ranges.
Any output current level outside of these two ranges is a fault condition. The
A1184 also features on-chip transient protection, and a Zener clamp to protect
against overvoltage conditions on the supply line.
1. VCC
2. GND
3. GND
1
2
3
The output current of the A1184 switches HIGH in the presence of a south polarity
magnetic field of sufficient strength; and switches LOW otherwise, including when
there is no significant magnetic field present.
Both devices are offered in two package styles: LH, a SOT-23W miniature low-
profile package for surface-mount applications, and UA, a three-lead ultramini
Single Inline Package (SIP) for through-hole mounting. Each package is available
in a lead (Pb) free version (suffix, –T) with 100% matte tin plated leadframe.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC ..........................................28 V
Reverse-Supply Voltage, VRCC ........................–18 V
Magnetic Flux Density, B .........................Unlimited
Operating Temperature
Factory-programmed versions are also available. Refer to: A1140, A1141, A1142,
A1143, A1145, and A1146.
Ambient, TA, Range E..................–40ºC to 85ºC
Ambient, TA, Range L................–40ºC to 150ºC
Maximum Junction, TJ(max)........................165ºC
Storage Temperature, TS ..................–65ºC to 170ºC
Features and Benefits
ꢀChopper stabilization
ꢀOn-chip protection
ꢀLow switchpoint drift over operating
temperature range
ꢀSupply transient protection
ꢀReverse-battery protection
ꢀOn-board voltage regulator
ꢀ3.5 V to 24 V operation
ꢀLow stress sensitivity
ꢀField-programmable for optimized
switchpoints
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1184-DS, Rev. 2
A1184
Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switch
Product Selection Guide
Supply Current at
Low Output, ICC(L)
(mA)
Pb-
free
Ambient, TA
(°C)
Output
South (+) Field2
Part Number
Packing1
Mounting
A1184ELHLT3
A1184ELHLT-T
A1184EUA
–
Yes
–
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
Surface mount
4-pin SIP through hole
Surface mount
–40 to 85
A1184EUA-T
A1184LLHLT
A1184LLHLT-T
A1184LUA
Yes
–
High
5 to 6.9
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
Yes
–
–40 to 150
4-pin SIP through hole
A1184LUA-T
Yes
aContact Allegro for additional packing options.
bSouth (+) magnetic fields must be of sufficient strength.
cThese variants are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is cur-
rently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near
future is probable. Samples are no longer available. Status date change May 2, 2005.
Functional Block Diagram
V+
VCC
Program/Lock
Programming
Offset
Logic
Regulator
Clock/Logic
0.01 uF
Low-Pass
Filter
Amp
GND
GND
Package UA Only
Allegro MicroSystems, Inc.
2
115 Northeast Cutoff, Box 15036
A1184-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1184
Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switch
ELECTRICAL CHARACTERISTICS over the operating voltage and temperature range, unless otherwise specified
Characteristic
Supply Voltage1
Symbol
VCC
Test Conditions
Device powered on
Min.
3.5
5
Typ.
Max.
24
Units
V
–
–
–
–
–
–
ICC(L)
B <BRP
B >BOP
6.9
17
mA
mA
V
Supply Current2
ICC(H)
12
28
–
Supply Zener Clamp Voltage
Supply Zener Clamp Current3
Reverse Supply Current
VZ(supply) ICC = ICC(L)(max) + 3 mA; TA = 25°C
40
IZ(supply)
IRCC
VZ(supply) = 28 V
9.9
–1.6
mA
mA
VRCC = –18 V
–
No bypass capacitor; capacitance of the
oscilloscope performing the measurement
= 20 pF
Output Slew Rate4
di/dt
–
36
–
mA/μs
Chopping Frequency
Power-On Time5
fC
ton
–
–
–
200
–
–
25
–
kHz
μs
–
After factory trimming; with and without
bypass capacitor (CBYP = 0.01 μF)
Power-On State6,7
POS
ton ≤ ton(max); VCC slew rate ≥ 25 mV/μs
HIGH
1VCC represents the generated voltage between the VCC pin and the GND pin.
2Relative values of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north magnetic
polarity; therefore greater B values indicate a stronger south polarity field (or a weaker north polarity field, if present).
3IZSUPPLY(max) = ICCL(max) + 3 mA.
4Measured without bypass capacitor between VCC and GND. Use of a bypass capacitor results in slower current change.
5Measured with and without bypass capacitor of 0.01 μF. Adding a larger bypass capacitor causes longer Power-On Time.
6POS is defined as true only with a VCC slew rate of 25 mV/μs or greater. Operation with a VCC slew rate less than 25 mV/μs can permanently harm
device performance.
7POS is undefined for t > ton or BRP < B < BOP
.
MAGNETIC CHARACTERISTICS1 over the operating voltage and temperature range, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Programmable Operate Point Range
BOPrange ICC = ICC(H)
300
–
600
G
Initial Operate Point Range
Switchpoint Step Size2
BOPinit
BRES
VCC = 12 V
–
8
–
–
–
5
262
16
5
300
24
–
G
G
VCC = 5 V, TA = 25°C
Switchpoint setting
Programming locking
Bit
Bit
G
Number of Programming Bits
–
1
–
Temperature Drift of BOP
Hysteresis
ΔBOP
–
±20
30
BHYS
BHYS = BOP – BRP
15
G
1Relative values of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north magnetic
polarity; therefore greater B values indicate a stronger south polarity field (or a weaker north polarity field, if present).
2The range of values specified for BRES is a maximum, derived from the cumulative programming bit errors.
Allegro MicroSystems, Inc.
3
115 Northeast Cutoff, Box 15036
A1184-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1184
Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switch
Characteristic Data
ICC(L) versus Ambient Temperature
at Various Levels of VCC
(A1184)
I
CC(H) versus Ambient Temperature
at Various Levels of VCC
(A1184)
20
18
16
14
12
10
10
8
VCC (V)
3.5
VCC (V)
3.5
6
12.0
24.0
12.0
24.0
4
2
0
-50
0
50
100
150
200
-50
0
50
100
150
200
Ambient Temperature, TA (°C)
Ambient Temperature, TA (°C)
Average BOP Bits versus Ambient Temperature
(A1184)
Hysteresis versus Ambient Temperature
at Various Levels of VCC
(A1184)
30
700
600
500
400
300
200
100
0
25
20
15
10
5
BOPinit
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
VCC (V)
3.5
12.0
24.0
-50
0
50
100
150
200
-50
0
50
100
150
200
Ambient Temperature, TA (°C)
Ambient Temperature, TA (°C)
Device Qualification Program
Contact Allegro MicroSystems for information.
EMC (Electromagnetic Compatibility) Requirements
Contact your local representative for EMC results.
Test Name
ESD – Human Body Model
ESD – Machine Model
Conducted Transients
Direct RF Injection
Bulk Current Injection
TEM Cell
Reference Specification
AEC-Q100-002
AEC-Q100-003
ISO 7637-1
ISO 11452-7
ISO 11452-4
ISO 11452-3
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
4
A1184-DS, Rev. 2
A1184
Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switch
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions*
Value Units
Package LH, 1-layer PCB with copper limited to solder pads
228 ºC/W
Package LH, 2-layer PCB with 0.463 in.2 of copper area each side
connected by thermal vias
RθJA
Package Thermal Resistance
110
ºC/W
Package UA, 1-layer PCB with copper limited to solder pads
165 ºC/W
*Additional thermal information available on Allegro Web site.
Power Derating Curve
25
24
23
V
CC(max)
22
21
20
19
18
17
16
15
14
13
12
11
10
9
2-layer PCB, Package LH
(RθJA = 110 ºC/W)
1-layer PCB, Package UA
(RθJA = 165 ºC/W)
8
7
1-layer PCB, Package LH
(RθJA = 228 ºC/W)
6
5
4
V
CC(min)
3
2
20
40
60
80
100
120
140
160
180
Temperature (ºC)
Power Dissipation versus Ambient Temperature
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
20
40
60
80
100
120
140
160
180
Temperature (°C)
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
A1184-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1184
Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switch
Functional Description
Operation
The output, ICC, of the A1184 device switches high after the
magnetic field at the Hall sensor exceeds the operate point
threshold, BOP. When the magnetic field is reduced to below the
release point threshold, BRP, the device output goes low. The dif-
ferences between the magnetic operate and release point is called
the hysteresis of the device, BHYS. This built-in hysteresis allows
clean switching of the output even in the presence of external
mechanical vibration and electrical noise. (See figure 1).
I+
ICC(H)
ICC(L)
0
B–
B+
BHYS
Figure 1. On the horizontal axis, the B+ direction indicates
increasing south polarity magnetic field strength, and the
B– direction indicates decreasing south polarity field strength
(including the case of increasing north polarity).
Allegro MicroSystems, Inc.
6
115 Northeast Cutoff, Box 15036
A1184-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1184
Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switch
Chopper Stabilization Technique
A limiting factor for switchpoint accuracy when using Hall
effect technology is the small signal voltage developed across
the Hall element. This voltage is proportionally small relative to
the offset that can be produced at the output of the Hall sensor
device. This makes it difficult to process the signal and maintain
an accurate, reliable output over the specified temperature and
voltage range.
technique is used, where the sampling is performed at twice
the chopper frequency (400KHz). The sampling demodulation
process produces higher accuracy and faster signal processing
capability. Using this chopper stabilization approach, the chip is
desensitized to the effects of temperature and stress. This tech-
nique produces devices that have an extremely stable quiescent
Hall output voltage, is immune to thermal stress, and has precise
recoverability after temperature cycling. This technique is made
possible through the use of a BiCMOS process which allows the
use of low-offset and low-noise amplifiers in combination with
high-density logic integration and sample-and-hold circuits.
Chopper stabilization is a unique approach used to minimize
Hall offset on the chip. The Allegro patented technique, dynamic
quadrature offset cancellation, removes key sources of the output
drift induced by temperature and package stress. This offset
reduction technique is based on a signal modulation-demodula-
tion process. The undesired offset signal is separated from the
magnetically induced signal in the frequency domain through
modulation. The subsequent demodulation acts as a modulation
process for the offset causing the magnetically induced signal
to recover its original spectrum at base band while the dc offset
becomes a high frequency signal. Then, using a low-pass filter,
the signal passes while the modulated dc offset is suppressed.
The repeatability of switching with a magnetic field is slightly
affected using a chopper technique. The Allegro high frequency
chopping approach minimizes the affect of jitter and makes it
imperceptible in most applications. Applications that may notice
the degradation are those that require the precise sensing of alter-
nating magnetic fields such as ring magnet speed sensing. For
those applications, Allegro recommends the “low jitter” family
of digital sensors.
The chopper stabilization technique uses a 200 kHz high fre-
quency clock. For demodulation process, a sample-and-hold
Regulator
Clock/Logic
Low-Pass
Filter
Hall Element
Amp
Figure 2. Chopper stabilization circuit (dynamic quadrature offset cancellation)
Allegro MicroSystems, Inc.
7
115 Northeast Cutoff, Box 15036
A1184-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1184
Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switch
Application Information
For additional general application information, visit the Allegro
MicroSystems Web site at www. allegromicro.com.
Typical Application Circuit
The A118x family of devices must be protected by an external
V+
bypass capacitor, CBYP, connected between the supply, VCC,
and the ground, GND, of the device. CBYP reduces both external
VCC
B
noise and the noise generated by the chopper-stabilization func-
tion. As shown in figure 3, a 0.01 μF capacitor is typical.
A118x
CBYP
Installation of CBYP must ensure that the traces that connect it to
the A118x pins are no greater than 5 mm in length.
0.01 uF
GND
GND
B
All high-frequency interferences conducted along the supply
lines are passed directly to the load through CBYP, and it serves
only to protect the A118x internal circuitry. As a result, the load
ECU (electronic control unit) must have sufficient protection,
other than CBYP, installed in parallel with the A118x.
A
A
B
Package UA Only
Maximum separation 5 mm
RSENSE
A series resistor on the supply side, RS (not shown), in combi-
nation with CBYP, creates a filter for EMI pulses. (Additional
information on EMC is provided on the Allegro MicroSystems
Web site.)
ECU
Figure 3. Typical application circuit
When determining the minimum VCC requirement of the A118x
device, the voltage drops across RS and the ECU sense resistor,
RSENSE, must be taken into consideration. The typical value for
RSENSE is approximately 100 Ω.
Allegro MicroSystems, Inc.
8
115 Northeast Cutoff, Box 15036
A1184-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1184
Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switch
Power Derating
Example: Reliability for VCC at TA=150°C, package UA, using
minimum-K PCB.
The device must be operated below the maximum junction
temperature of the device, TJ(max). Under certain combinations of
peak conditions, reliable operation may require derating sup-
plied power or improving the heat dissipation properties of the
application. This section presents a procedure for correlating
factors affecting operating TJ. (Thermal data is also available on
the Allegro MicroSystems Web site.)
Observe the worst-case ratings for the device, specifically:
RθJA=165°C/W, TJ(max) =165°C, VCC(max)= 24 V, and
ICC(max) = 17 mA.
Calculate the maximum allowable power level, PD(max). First,
invert equation 3:
The Package Thermal Resistance, RθJA, is a figure of merit sum-
marizing the ability of the application and the device to dissipate
heat from the junction (die), through all paths to the ambient air.
Its primary component is the Effective Thermal Conductivity,
K, of the printed circuit board, including adjacent devices and
traces. Radiation from the die through the device case, RθJC, is
relatively small component of RθJA. Ambient air temperature,
TA, and air motion are significant external factors, damped by
overmolding.
ΔTmax = TJ(max) – TA = 165°C–150°C = 15°C
This provides the allowable increase to TJ resulting from internal
power dissipation. Then, invert equation 2:
PD(max) = ΔTmax ÷RθJA =15°C÷165 °C/W=91mW
Finally, invert equation 1 with respect to voltage:
VCC(est) = PD(max) ÷ ICC(max) = 91mW÷17mA=5 V
The result indicates that, at TA, the application and device can
The effect of varying power levels (Power Dissipation, PD), can
be estimated. The following formulas represent the fundamental
relationships used to estimate TJ, at PD.
dissipate adequate amounts of heat at voltages ≤VCC(est)
.
Compare VCC(est) to VCC(max). If VCC(est) ≤ VCC(max), then reli-
able operation between VCC(est) and VCC(max) requires enhanced
RθJA. If VCC(est) ≥ VCC(max), then operation between VCC(est) and
VCC(max) is reliable under these conditions.
PD = VIN
I
(1)
(2)
(3)
×
IN
ΔT = PD
R
θJA
×
TJ = TA + ΔT
For example, given common conditions such as: TA= 25°C,
VCC = 12 V, ICC = 4 mA, and RθJA = 140 °C/W, then:
PD = VCC
I
= 12 V 4 mA = 48 mW
×
×
CC
ΔT = PD
R
= 48 mW 140 °C/W = 7°C
×
×
θJA
TJ = TA + ΔT = 25°C + 7°C = 32°C
A worst-case estimate, PD(max), represents the maximum allow-
able power level (VCC(max), ICC(max)), without exceeding TJ(max)
at a selected RθJA and TA.
,
Allegro MicroSystems, Inc.
9
115 Northeast Cutoff, Box 15036
A1184-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1184
Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switch
Programming Protocol
V+
The operate switchpoint, BOP, can be field-programmed. To do
V
PH
so, a coded series of voltage pulses through the VCC pin is used
to set bitfields in onboard registers. The effect on the device
output can be monitored, and the registers can be cleared and
set repeatedly until the required BOP is achieved. To make the
setting permanent, bitfield-level solid state fuses are blown, and
finally, a device-level fuse is blown, blocking any further cod-
V
PM
V
PL
0
T
d(P)
ing. It is not necessary to program the release switchpoint, BRP
because the difference between BOP and BRP, referred to as the
hysteresis, BHYS, is fixed.
,
T
d(0)
T
d(1)
t
The range of values between BOP(min) and BOP(max) is scaled to
31 increments. The actual change in magnetic flux (G) repre-
Figure 4. Pulse amplitudes and durations
sented by each increment is indicated by BRES (see the Operating
Characteristics table; however, testing is the only method for
verifying the resulting BOP). For programming, the 31 incre-
ments are individually identified using 5 data bits, which are
physically represented by 5 bitfields in the onboard registers.
By setting these bitfields, the corresponding calibration value is
programmed into the device.
Additional information on device programming and program-
ming products is available on www. allegromicro.com. Program-
ming hardware is available for purchase, and programming
software is available free of charge.
Code Programming. Each bitfield must be individually set. To
do so, a pulse sequence must be transmitted for each bitfield that
is being set to 1. If more than one bitfield is being set to 1, all
pulse sequences must be sent, one after the other, without allow-
ing VCC to fall to zero (which clears the registers).
Three voltage levels are used in programming the device: a low
voltage, VPL , a minimum required to sustain register settings; a
mid-level voltage, VPM , used to increment the address counter
in the device; and a high voltage, VPH , used to separate sets of
VPM pulses (when short in duration) and to blow fuses (when
long in duration). A fourth voltage level, essentially 0 V, is used
to clear the registers between pulse sequences. The pulse values
are shown in the Programming Protocol Characteristics table and
in figure 4.
The same pulse sequence is used to provisionally set bitfields as
is used to permanently set bitfield-level fuses. The only differ-
ence is that when provisionally setting bitfields, no fuse-blowing
pulse is sent at the end of the pulse sequence.
PROGRAMMING PROTOCOL CHARACTERISTICS, over operating temperature range, unless otherwise noted
Characteristic
Symbol
VPL
Test Conditions
Min.
4.5
Typ.
5.0
Max.
5.5
Units
Minimum voltage range during programming
V
V
V
Programming Voltage1
VPM
11.5
25.0
12.5
26.0
13.5
27.0
VPH
Programming Current2
Pulse Width
IPP
td(0)
td(1)
tr = 11 μs; 5 V → 26 V; CBYP = 0.1 μF
-
190
-
-
-
mA
μs
OFF time between programming bits
20
20
-
-
Pulse duration for enable and addressing
sequences
μs
td(P)
tr
Pulse duration for fuse blowing
VPL to VPM; VPL to VPH
100
5
300
-
μs
μs
μs
Pulse Rise Time
Pulse Fall Time
-
-
20
tf
VPM to VPL; VPH to VPL
5
100
1Programming voltages are measured at the VCC pin.
2A bypass capacitor with a minimum capacitance of 0.1 μF must be connected from VCC to the GND pin of the A118x device in order to
provide the current necessary to blow the fuse.
Allegro MicroSystems, Inc.
10
115 Northeast Cutoff, Box 15036
A1184-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1184
Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switch
The pulse sequences consist of the following groups of pulses:
vertently setting the bitfield to 1. Instead, blowing the device-
level fuse protects the 0 bitfields from being accidentally set in
the future.
1. An enable sequence.
2. A bitfield address sequence.
When provisionally trying the calibration value, one pulse
sequence is used, using decimal values. The sequence for setting
the value 510 is shown in figure 5.
3. When permanently setting the bitfield, a long VPH fuse-blow-
ing pulse. (Note: Blown bit fuses cannot be reset.)
4. When permanently setting the bitfield, the level of VCC must
be allowed to drop to zero between each pulse sequence, in
order to clear all registers. However, when provisionally set-
ting bitfields, VCC must be maintained at VPL between pulse
sequences, in order to maintain the prior bitfield settings while
preparing to set additional bitfields.
When permanently setting values, the bitfields must be set indi-
vidually, and 510 must be programmed as binary 101. Bit 3 is
set to 1 (0001002, which is 410), then bit 1 is set to 1 (0000012,
which is 110). Bit 2 is ignored, and so remains 0.Two pulse
sequences for permanently setting the calibration value 5 are
shown in figure 6. The final VPH pulse is maintained for a longer
period, enough to blow the corresponding bitfield-level fuse.
Bitfields that are not set are evaluated as zeros. The bitfield-level
fuses for 0 value bitfields are never blown. This prevents inad-
V+
V
PH
V
PM
V
PL
0
Enable
Address
Clear
t
Optional
Monitoring
Try 5
10
Figure 5. Pulse sequence to provisionally try calibration value 5.
V+
V
PH
V
PM
V
PL
0
Address
Blow
Enable
Address
Blow
Enable
Encode 00100 (4
2
)
Encode 00001 (1
10
)
10
2
t
Figure 6. Pulse sequence to permanently encode calibration value 5 (101 binary, or
bitfield address 3 and bitfield address 1).
Allegro MicroSystems, Inc.
11
115 Northeast Cutoff, Box 15036
A1184-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1184
Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switch
V+
V
PH
Enabling Addressing Mode. The first segment of code is a
keying sequence used to enable the bitfield addressing mode. As
shown in figure 7, this segment consists of one short VPH pulse,
one VPM pulse, and one short VPH pulse, with no supply inter-
ruptions. This sequence is designed to prevent the device from
being programmed accidentally, such as by noise on the supply
line.
V
PM
V
PL
0
t
Figure 7. Addressing mode enable pulse sequence
V+
V
V
PH
Address 1
Address 2
Address n ( ≤ 31)
Address Selection. After addressing mode is enabled, the
target bitfield address, is indicated by a series of VPM pulses, as
shown in figure 8.
PM
V
PL
0
t
Figure 8. Pulse sequence to select addresses
V+
Falling edge of final B address digit
OP
V
PH
Lock Bit Programming. After the desired BOP calibration value
is programmed, and all of the corresponding bitfield-level fuses
are blown, the device-level fuse should be blown. To do so, the
lock bit (bitfield address 32) should be encoded as 1 and have
its fuse blown. This is done in the same manner as permanently
setting the other bitfields, as shown in figure 9.
V
PM
V
PL
32 pulses
0
Enable
Address
Blow
Encode Lock Bit
t
Figure 9. Pulse sequence to encode lock bit
Allegro MicroSystems, Inc.
12
115 Northeast Cutoff, Box 15036
A1184-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1184
Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switch
Package LH, 3-Pin (SOT-23W)
3.10 .122
2.90 .114
1.49 .059
NOM
8º
0º
0.70 .028
BSC
3
0.28 .011
NOM
0.20 .008
0.13 .005
C
0.96 .038
NOM
2.40 .094
BSC
2.10 .083
1.85 .073
A
3.00 .118
2.70 .106
0.25 .010
MIN
1.00 .039
BSC
0.95 .037
BSC
1
2
0.25 .010
BSC
Seating Plane
Gauge Plane
Dimensions in millimeters
U.S. Customary dimensions (in.) in brackets, for reference only
Hall element
A
B
C
0.50 .020
0.30
1.13 .045
0.87 .034
Active Area Depth 0.28 [.011]
Fits SC–59A Solder Pad Layout
.012
0.55 .022
REF
0.15 .006
0.00 .000
0.95 .037
BSC
Package UA, 3-Pin
.164 4.17
.159 4.04
45°
BSC
.0195 0.50
NOM
.0805 2.04
NOM
.062 1.57
.058 1.47
1.44
.0565
NOM
.122 3.10
.117 2.97
45°
BSC
B
.085 2.16
MAX
.031 0.79
REF
.640 16.26
.600 15.24
A
.017 0.44
.014 0.35
1
2
3
.019 0.48
.014 0.36
.050 1.27
BSC
Dimensions in inches
Metric dimensions (mm) in brackets, for reference only
A
B
Dambar removal protrusion
Hall element
Allegro MicroSystems, Inc.
13
115 Northeast Cutoff, Box 15036
A1184-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1184
Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switch
The products described herein are manufactured under one
or more of the following U.S. patents: 5,045,920; 5,264,783;
5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319;
5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other
patents pending.
Allegro MicroSystems, Inc. reserves the right to make, from time
to time, such departures from the detail specifications as may be
required to permit improvements in the performance, reliability,
or manufacturability of its products. Before placing an order, the
user is cautioned to verify that the information being relied upon is
current.
Allegro products are not authorized for use as critical compo-
nents in life-support devices or systems without express written
approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no respon-
sibility for its use; nor for any infringement of patents or other
rights of third parties which may result from its use.
Copyright © 2004, 2005 Allegro MicroSystems, Inc.
Allegro MicroSystems, Inc.
14
115 Northeast Cutoff, Box 15036
A1184-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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