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参数资料
| 型号： | DS1374C-33 |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO16 |
| 封装： | 0.300 INCH, SOP-16 |
| 文件页数： | 10/15页 |
| 文件大小： | 616K |
| 代理商： | DS1374C-33 |
D
address range 00h–03h. When the counter is read, the
current time of day is latched into a register, which is
output on the serial data line while the counter contin-
ues to increment.
Watchdog/Alarm Counter
The contents of the watchdog/alarm counter, which is a
separate 24-bit down counter, are accessed in the
address range 04h–06h. When this counter is written, the
counter and a seed register are loaded with the desired
value. When the counter is to be reloaded, it uses the
value in the seed register. When the counter is read, the
current counter value is latched into a register, which is
output on the serial data line while the counter continues
to decrement.
If the counter is not needed, it can be disabled and used
as a 24-bit cache of NV RAM by setting the WACE bit in
the control register to logic 0. If all 24 bits of the watch-
dog/alarm counter are written to zero when
WACE = 1, the counter is disabled and the AF bit is
not set.
When the WD/
ALM
bit in the control register is set to a
logic 0, the WD/
ALM
counter decrements every second
until it reaches zero. At this point, the AF bit in the status
register is set and the counter is reloaded and restarted.
If AF is set when the watchdog function is enabled, the
output selected by WDSTR immediately becomes active.
When the WD/
ALM
bit is set to logic 1, the WD/
ALM
counter decrements every 1/4096 of a second (approxi-
mately every 244μs) until it reaches zero, sets the AF bit
in the status register, and stops. If WDSTR = 0, the
RST
pin pulses low for 250ms, and accesses to the DS1374
are inhibited. At the end of the 250ms pulse, the AF bit is
cleared to zero, the
RST
pin becomes high impedance,
and read/write access to the DS1374 is enabled. If AIE =
1 and WDSTR = 1, the
INT
pin pulses low for 250ms. The
pulse cannot be truncated by writing either AF or AIE to
zero during the low time of the
INT
pin. If the WD/
ALM
counter is written during the 250ms pulse, the counter
starts decrementing upon the pulse completion. At the
completion, the AF bit clears to zero and the
INT
pin
becomes high impedance. The WD/
ALM
counter can be
reloaded and restarted before the counter reaches zero
by reading or writing any of the WD/
ALM
counter regis-
ters.
Power-Up/Power-Down Reset and
Pushbutton Reset Functions
A precision temperature-compensated reference and
comparator circuit monitors the status of V
CC
. When an
out-of-tolerance condition occurs, an internal power-fail
signal is generated that forces the
RST
pin low and
blocks read/write access to the DS1374. When V
CC
returns to an in-tolerance condition, the
RST
pin is held
low for 250ms to allow the power supply to stabilize. If
the
EOSC
bit is set to a logic 1 (to disable the oscillator in
battery-backup mode), the reset signal is kept active for
250ms plus the startup time of the oscillator.
The DS1374 provides for a pushbutton switch to be con-
nected to the
RST
output pin. When the DS1374 is not in
a reset cycle, it continuously monitors the
RST
signal for
a low-going edge. If an edge is detected, the DS1374
debounces the switch by pulling the
RST
pin low and
inhibits read/write access. After the internal 250ms timer
has expired, the device continues to monitor the
RST
line. If the line is still low, the DS1374 continues to moni-
tor the line, looking for a rising edge. Upon detecting
release, the DS1374 forces the
RST
pin low and holds it
low for an additional 250ms.
I
2
C, 32-Bit Binary Counter Watchdog RTC with
Trickle Charger and Reset Input/Output
10
____________________________________________________________________
ADDRESS
00H
01H
02H
03H
04H
05H
06H
07H
08H
09H
BIT 7
BIT 6
BIT 5
BIT 4
TOD Counter Byte 0
TOD Counter Byte 1
TOD Counter Byte 2
TOD Counter Byte 3
WD/
ALM
Counter Byte 0
WD/
ALM
Counter Byte 1
WD/
ALM
Counter Byte 2
BBSQW
0
TCS0
BIT 3
BIT 2
BIT 1
BIT 0
FUNCTION
Time-of-Day Counter
Time-of-Day Counter
Time-of-Day Counter
Time-of-Day Counter
Watchdog/Alarm Counter
Watchdog/Alarm Counter
Watchdog/Alarm Counter
Control
Status
Trickle Charger
EOSC
OSF
TCS3
WACE
0
TCS2
WD/
ALM
0
TCS1
WDSTR
0
DS1
RS2
0
DS0
RS1
0
ROUT1
AIE
AF
ROUT0
Table 2. Address Map
Note:
Unless otherwise specified, the state of the registers is not defined when power is first applied.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1374C-33- | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output |
| DS1374C-33# | 功能描述:实时时钟 I2C 32-Bit Binary Counter Watchdog RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1374C-33## | 制造商:Maxim Integrated Products 功能描述: |
| DS1374C-33# | 制造商:Maxim Integrated Products 功能描述:IC RTC BINARY SOIC-16 |
| DS1374C-33#T&R | 制造商:Maxim Integrated Products 功能描述:I2C 32-BIT BINARY COUNTER WATCHDOG RTC 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 16SOIC W - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC I2C W/CHARGER 16-SOIC 制造商:Maxim Integrated Products 功能描述:Real Time Clock I2C 32-Bit Binary Counter Watchdog |
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