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参数资料
| 型号： | DS1388Z-3 |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | XO, clock |
| 英文描述： | The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each |
| 中文描述： | REAL TIME CLOCK, PDSO8 |
| 封装： | 0.150 INCH, SOIC-8 |
| 文件页数： | 12/18页 |
| 文件大小： | 381K |
| 代理商： | DS1388Z-3 |
D
Watchdog Alarm Counter
The contents of the watchdog alarm counter, which is a
separate two-byte BCD down counter, are accessed in
the address range 08h–09h in block 0h. It is programma-
ble in 10ms intervals from 0.01 to 99.99 seconds. When
this counter is written, both the counter and a seed regis-
ter 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 16-bit cache of battery-backed RAM by set-
ting the WDE bit in the control register to logic 0. If all
16 bits of the watchdog alarm counter are written to a
zero when WDE = 1, the counter is disabled and the
WF bit is not set.
When the WDE bit in the control register is set to a logic
1 and a non-zero value is written into the watchdog reg-
isters, the watchdog alarm counter decrements every
1/100 second, until it reaches zero. At this point, the WF
bit in the flag register is set. If WD/
RST
= 1, the
RST
pin
is pulsed low for t
RST
and access to the DS1388 is
inhibited. At the end of t
RST
, the
RST
pin becomes high
impedance, and read/write access to the DS1388 is
enabled. The WF flag remains set until cleared by writ-
ing WF to logic 0. The watchdog alarm counter can be
reloaded and restarted before the counter reaches zero
by reading or writing any of the watchdog alarm
counter registers.
The WDE bit must be set to zero before writing the
watchdog registers. After writing the watchdog regis-
ters, WDE must be set to one to enable the watchdog.
Power-Up/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 blocks read/write access to the
device and forces the
RST
pin low. When V
CC
returns
to an in-tolerance condition, the internal power-fail sig-
nal is held active for t
RST
to allow the power supply to
stabilize, and the
RST
pin is held low. If the
EOSC
bit is
set to a logic 1 (to disable the oscillator in battery-back-
up mode), the internal power-fail signal and the
RST
pin
are kept active for t
RST
plus the oscillator startup time.
The DS1388 provides for a pushbutton switch to be
connected to the
RST
output pin. When the DS1388 is
not in a reset cycle, it continuously monitors the
RST
signal for a low-going edge. If an edge is detected, the
part debounces the switch by pulling the
RST
pin low
and inhibits read/write access. After the internal timer
has expired, the part continues to monitor the
RST
line.
If the line is still low, it continues to monitor the line look-
ing for a rising edge. Upon detecting release, the part
forces the
RST
pin low and holds it low for t
RST
.
Special-Purpose Registers
The DS1388 has three additional registers (control,
flag, and trickle charger) that control the real-time
clock, watchdog, and trickle charger.
Flag Register (00Bh)
Bit 7: Oscillator Stop Flag (OSF).
A logic 1 in this bit
indicates that the oscillator has stopped or was
stopped for some period of time and may be used to
judge the validity of the clock and calendar data. This
bit is edge triggered and is set to logic 1 when the
internal circuitry senses the oscillator has transitioned
from a normal run state to a STOP condition. The follow-
ing are examples of conditions that can cause the OSF
bit to be set:
1) The first time power is applied.
2) The voltage present on both V
CC
and V
BACKUP
are
insufficient to support oscillation.
3) The
EOSC
bit is turned off.
4) External influences on the crystal (i.e., noise, leak-
age, etc.).
This bit remains at logic 1 until written to logic 0. This
bit can only be written to logic 0. Attempting to write
OSF to logic 1 leaves the value unchanged.
Bit 6: Watchdog Alarm Flag (WF).
A logic 1 in this bit
indicates that the watchdog counter reached zero. If
WDE and WD/
RST
are set to 1, the
RST
pin pulses low
for t
RST
when the watchdog counter reaches zero and
sets WF = 1. At the completion of the pulse, the WF bit
remains set to logic 1. Writing this bit to logic 0 clears
the WF flag. This bit can only be written to logic 0.
Attempting to write logic 1 leaves the value unchanged.
Bits 5 to 0:
These bits read as zero and cannot be
modified.
I
2
C RTC/Supervisor with Trickle Charger
and 512 Bytes EEPROM
12
____________________________________________________________________
Flag Register (00Bh)
BIT 7
OSF
BIT 6
WF
BIT 5
0
BIT 4
0
BIT 3
0
BIT 2
0
BIT 1
0
BIT 0
0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1388Z-3+ | 功能描述:实时时钟 I2C RTC/Supervisor w/Trickle Charger 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 |
| DS1388Z-3+T&R | 制造商:Maxim Integrated Products 功能描述:2WIRE RTC 3V,SUPRVSR &EPROM PB-F TR - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC I2C W/CHARGER 8-SOIC |
| DS1388Z-3+T&R | 功能描述:实时时钟 I2C RTC/Supervisor w/Trickle Charger 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 |
| DS1388Z-33 | 功能描述:实时时钟 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 |
| DS1388Z-33+ | 功能描述:实时时钟 I2C RTC/Supervisor w/Trickle Charger 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 |
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