1340A1-3 [MAXIM]

I2C RTC with Trickle Charger; I²C RTC ,带有涓流充电器
1340A1-3
元器件型号: 1340A1-3
生产厂家: MAXIM INTEGRATED PRODUCTS    MAXIM INTEGRATED PRODUCTS
描述和应用:

I2C RTC with Trickle Charger
I²C RTC ,带有涓流充电器

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Rev 4; 3/06
I
2
C RTC with Trickle Charger
General Description
The DS1340 is a real-time clock (RTC)/calendar that is
pin compatible and functionally equivalent to the ST
M41T00, including the software clock calibration. The
device additionally provides trickle-charge capability
on the V
BACKUP
pin, a lower timekeeping voltage, and
an oscillator STOP flag. Block access of the register
map is identical to the ST device. Two additional regis-
ters, which are accessed individually, are required for
the trickle charger and flag. The clock/calendar pro-
vides seconds, minutes, hours, day, date, month, and
year information. A built-in power-sense circuit detects
power failures and automatically switches to the back-
up supply. Reads and writes are inhibited while the
clock continues to run. The device is programmed seri-
ally through an I
2
C
*
bidirectional bus.
Features
Enhanced Second Source for the ST M41T00
Available in a Surface-Mount Package with an
Integrated Crystal (DS1340C)
Fast (400kHz) I
2
C Interface
Software Clock Calibration
RTC Counts Seconds, Minutes, Hours, Day, Date,
Month, and Year
Automatic Power-Fail Detect and Switch Circuitry
Trickle-Charge Capability
Low Timekeeping Voltage Down to 1.3V
Three Operating Voltage Ranges (1.8V, 3V, and 3.3V)
Oscillator Stop Flag
Available in 8-Pin
µSOP
or SO Packages
Underwriters Laboratory (UL) Recognized
DS1340
Applications
Portable Instruments
Point-of-Sale Equipment
Medical Equipment
Telecommunications
PART
DS1340Z-18
DS1340Z-3
DS1340Z-33
DS1340U-18
DS1340U-3
DS1340U-33
V
CC
CRYSTAL
V
CC
R
PU
R
PU
1
X1
6 SCL
CPU
2
X2
8
V
CC
FT/OUT
7
C1
V
CC
Ordering Information
TEMP RANGE PIN-PACKAGE
-40°C to +85°C 8 SO (0.150in)
-40°C to +85°C 8 SO (0.150in)
-40°C to +85°C 8 SO (0.150in)
-40°C to +85°C 8 µSOP
-40°C to +85°C 8 µSOP
-40°C to +85°C 8 µSOP
-40°C to +85°C 16 SO
-40°C to +85°C 16 SO
-40°C to +85°C 16 SO
-40°C to +85°C 8 SO (0.150in)
-40°C to +85°C 8 SO (0.150in)
-40°C to +85°C 8 SO (0.150in)
-40°C to +85°C 8 µSOP
-40°C to +85°C 16 SO
-40°C to +85°C 16 SO
-40°C to +85°C 16 SO
TOP
MARK
D1340-18
DS1340-3
D1340-33
1340A1-18
1340A1-3
1340A1-33
1340C-18
1340C-3
1340C-33
D1340-18
DS1340-3
D1340-33
1340A1-18
1340A1-3
1340A1-33
1340C-18
1340C-3
1340C-33
Typical Operating Circuit
DS1340C-18
DS1340C-3
DS1340C-33
DS1340Z-18+
DS1340Z-3+
DS1340Z-33+
DS1340U-3+
DS1340C-18#
DS1340C-3#
DS1340C-33#
DS1340U-18+ -40°C to +85°C 8 µSOP
DS1340
5 SDA
R
PU
= t
R
/ C
B
GND
4
V
BACKUP
3
DS1340U-33+ -40°C to +85°C 8 µSOP
+
Denotes a lead-free/RoHS-compliant device.
*Purchase
of I
2
C components from Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys
a license under the Philips I
2
C Patent Rights to use these com-
ponents in an I
2
C system, provided that the system conforms to
the I
2
C Standard Specification as defined by Philips.
#
Denotes a RoHS-compliant device that may include lead that
is exempt under RoHS requirements. The lead finish is JESD97
category e3, and is compatible with both lead-based and lead-
free soldering processes.
A "+" anywhere on the top mark denotes a lead-free device.
A "#" denotes a RoHS-compliant device.
Pin Configurations appear at end of data sheet.
______________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
I
2
C RTC with Trickle Charger
DS1340
ABSOLUTE MAXIMUM RATINGS
Voltage Range on V
CC
Pin Relative to Ground .....-0.3V to +6.0V
Voltage Range on SDA, SCL, and FT/OUT
Relative to Ground..................................-0.3V to (V
CC
+ 0.3V)
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature Range............................See IPC/JEDEC
J-STD-020 Specification
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
AC ELECTRICAL CHARACTERISTICS
(V
CC
= V
CC MIN
to V
CC MAX
, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1, Figure 1)
PARAMETER
SCL Clock Frequency
Bus Free Time Between STOP
and START Conditions
Hold Time (Repeated) START
Condition (Note 2)
Low Period of SCL Clock
High Period of SCL Clock
Data Hold Time (Notes 3, 4)
Data Setup Time (Note 5)
START Setup Time
Rise Time of SDA and SCL
Signals (Note 6)
Fall Time of SDA and SCL Signals
(Note 6)
Setup Time for STOP Condition
Capacitive Load for Each Bus
Line
I/O Capacitance (SCL, SDA)
Pulse Width of Spikes that Must
be Suppressed by the Input Filter
Oscillator Stop Flag (OSF) Delay
SYMBOL
f
SCL
t
BUF
t
HD:STA
t
LOW
t
HIGH
t
HD:DAT
t
SU:DAT
t
SU:STA
t
R
t
F
t
SU:STO
C
B
C
I/O
t
SP
t
OSF
Fast mode
(Note 7)
CONDITIONS
Standard mode
Fast mode
Standard mode
Fast mode
Standard mode
Fast mode
Standard mode
Fast mode
Standard mode
Fast mode
Standard mode
Fast mode
Standard mode
Fast mode
Standard mode
Fast mode
Standard mode
Fast mode
Standard mode
Fast mode
Standard mode
Fast mode
(Note 6)
10
30
100
MIN
0
100
4.7
1.3
4.0
0.6
4.7
1.3
4.0
0.6
0
0
250
100
4.7
0.6
20 + 0.1C
B
20 + 0.1C
B
20 + 0.1C
B
20 + 0.1C
B
4.7
0.6
400
1000
300
300
300
0.9
0.9
TYP
MAX
100
400
UNITS
kHz
µs
µs
µs
µs
µs
ns
µs
ns
ns
µs
pF
pF
ns
ms
2
_____________________________________________________________________
I
2
C RTC with Trickle Charger
RECOMMENDED DC OPERATING CONDITIONS
(V
CC
= V
CC MIN
to V
CC MAX
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= 3.3V, T
A
= +25°C, unless
otherwise noted.) (Note 1)
PARAMETER
Supply Voltage (Note 8)
Input Logic 1 (SDA, SCL)
Input Logic 0 (SDA, SCL)
Supply Voltage, Pullup
(FT/OUT, SDA, SCL), V
CC
= 0V
Backup Supply Voltage (Note 8)
SYMBOL
DS1340-18
V
CC
V
IH
V
IL
V
PU
DS1340-3
DS1340-33
(Note 8)
(Note 8)
(Note 8)
DS1340-18
V
BACKUP
R1
Trickle-Charge Current-Limiting
Resistors
R2
R3
Power-Fail Voltage (Note 8)
Input Leakage (SCL, CLK)
I/O Leakage (SDA, FT/OUT)
SDA Logic 0 Output
V
PF
I
LI
I
LO
I
OLSDA
V
CC
> 2V; V
OL
= 0.4V
1.7V < V
CC
< 2V; V
OL
= 0.2 x V
CC
V
CC
> 2V; V
OL
= 0.4V
FT/OUT Logic 0 Output
I
OLSQW
1.7V < V
CC
< 2V; V
OL
= 0.2 x V
CC
1.3V < V
CC
< 1.7V; V
OL
= 0.2x V
CC
DS1340-18
Active Supply Current (Note 13)
I
CCA
DS1340-3
DS1340-33
DS1340-18
Standby Current (Note 14)
V
BACKUP
Leakage Current
I
CCS
DS1340-3
DS1340-33
I
BACKUPLKG
V
BACKUP
= 3.7V
72
108
192
60
81
100
DS1340-3
DS1340-33
(Notes 9, 10)
(Note 11)
(Note 12)
DS1340-18
DS1340-3
DS1340-33
1.51
2.45
2.70
-1
-1
1.3
1.3
1.3
250
2000
4000
1.6
2.6
2.88
1.71
2.7
2.97
+1
+1
3.0
3.0
3.0
3.0
250
150
200
300
100
125
150
100
nA
µA
µA
µA
µA
mA
mA
µA
V
CONDITIONS
MIN
1.71
2.7
2.97
0.7 x V
CC
-0.3
TYP
1.8
3.0
3.3
MAX
1.89
3.3
5.5
V
CC
+ 0.3
+0.3 x V
CC
5.5
3.7
3.7
5.5
V
V
V
V
UNITS
V
DS1340
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 0V, V
BACKUP
= 3.7V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
I
BACKUP1
I
BACKUP2
I
BACKUP3
V
BACKUP
Data-Retention Current
CONDITIONS
OSC ON, FT = 0 (Note 15)
OSC ON, FT = 1 (Note 15)
OSC ON, FT = 0, V
BACKUP
= 3.0V,
T
A
= +25°C (Notes 15, 16)
MIN
TYP
800
850
800
25.0
MAX
1150
1250
1000
100
nA
UNITS
V
BACKUP
Current
nA
I
BACKUPDR
OSC OFF
_____________________________________________________________________
3
I
2
C RTC with Trickle Charger
DS1340
POWER-UP/POWER-DOWN CHARACTERISTICS
(T
A
= -40°C to +85°C) (Figure 2)
PARAMETER
Recovery at Power-Up
V
CC
Fall Time; V
PF(MAX)
to
V
PF(MIN)
V
CC
Rise Time; V
PF(MIN)
to
V
PF(MAX)
SYMBOL
t
REC
t
VCCF
t
VCCR
(Note 17)
300
0
CONDITIONS
MIN
TYP
MAX
2
UNITS
ms
µs
µs
WARNING:
Under no circumstances are negative undershoots, of any amplitude, allowed when device is in battery-backup mode.
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Limits at -40°C are guaranteed by design and not production tested.
After this period, the first clock pulse is generated.
A device must internally provide a hold time of at least 300ns for the SDA signal (referred to as the V
IH(MIN)
of the SCL
signal) to bridge the undefined region of the falling edge of SCL.
The maximum t
HD:DAT
only has to be met if the device does not stretch the low period (t
LOW
) of the SCL signal.
A fast-mode device can be used in a standard-mode system, but the requirement t
SU:DAT
to 250ns must be met. This
is automatically the case if the device does not stretch the low period of the SCL signal. If such a device does stretch the
low period of the SCL signal, it must output the next data bit to the SDA line t
R MAX
+ t
SU:DAT
= 1000 + 250 = 1250ns
before the SCL line is released.
C
B
—total capacitance of one bus line in pF.
The parameter t
OSF
is the period of time the oscillator must be stopped for the OSF flag to be set over the 0V
V
CC
V
CCMAX
and 1.3V
V
BAT
3.7V range.
All voltages are referenced to ground.
Measured at V
CC
= typ, V
BACKUP
= 0V, register 08h = A5h.
The use of the 250Ω trickle-charge resistor is not allowed at V
CC
> 3.63V and should not be enabled.
Measured at V
CC
= typ, V
BACKUP
= 0V, register 08h = A6h.
Measured at V
CC
= typ, V
BACKUP
= 0V, register 08h = A7h.
I
CCA
—SCL clocking at max frequency = 400kHz.
Specified with I
2
C bus inactive.
Measured with a 32.768kHz crystal attached to the X1 and X2 pins.
Limits at +25°C are guaranteed by design and not production tested.
This delay applies only if the oscillator is enabled and running. If the oscillator is disabled or stopped, no power-up delay
occurs.
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
Note 12:
Note 13:
Note 14:
Note 15:
Note 16:
Note 17:
SDA
t
BUF
t
LOW
t
R
t
F
t
HD:STA
t
SP
SCL
t
HD:STA
STOP
START
t
HD:DAT
t
HIGH
t
SU:DAT
REPEATED
START
t
SU:STA
t
SU:STO
Figure 1. Data Transfer on I
2
C Serial Bus
4
_____________________________________________________________________
I
2
C RTC with Trickle Charger
DS1340
V
CC
V
PF(MAX)
V
PF(MIN)
tF
V
PF
V
PF
tR
tRPU
tRST
RST
INPUTS
RECOGNIZED
DON'T CARE
RECOGNIZED
HIGH-Z
OUTPUTS
VALID
VALID
Figure 2. Power-Up/Power-Down Timing
Typical Operating Characteristics
(V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.)
I
CCSA
vs. V
CC
FT = 0
DS1340 toc01
I
CCS
vs. V
CC
FT = 0
DS1340 toc02
I
BACKUP1
(FT = 0) vs. V
BACKUP
800
SUPPLY CURRENT (nA)
750
700
650
600
550
500
DS1340 toc03
250
150
125
SUPPLY CURRENT (µA)
100
-3.0V
75
50
25
-1.8V
850
200
SUPPLY CURRENT (µA)
-3.3V
150
100
50
450
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
V
CC
(V)
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
V
CC
(V)
400
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
V
BACKUP
(V)
I
BACKUP2
(FT = 1) vs. V
BACKUP
DS1340 toc04
I
BACKUP3
vs. TEMPERATURE
850
800
SUPPLY CURRENT (nA)
750
700
650
600
550
500
FREQUENCY (Hz)
V
BACKUP
= 3.0V
DS1340 toc05
FT vs. V
BACKUP
511.9995
511.9990
511.9985
511.9980
511.9975
511.9970
511.9965
511.9960
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
V
BACKUP
(V)
DS1340 toc06
850
800
SUPPLY CURRENT (nA)
750
700
650
600
550
500
450
400
512.0000
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
V
BACKUP
(V)
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
_____________________________________________________________________
5
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