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參數(shù)資料
| 型號(hào)： | M41ST84WMQ6 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO16 |
| 封裝： | PLASTIC, SOP-16 |
| 文件頁數(shù)： | 4/29頁 |
| 文件大?。?/td> | 481K |
| 代理商： | M41ST84WMQ6 |
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M41ST84W
12/29
WRITE Mode
In this mode the master transmitter transmits to
the M41ST84W slave receiver. Bus protocol is
shown in Figure 12., page 12. Following the
START condition and slave address, a logic '0' (R/
W=0) is placed on the bus and indicates to the ad-
dressed device that word address An will follow
and is to be written to the on-chip address pointer.
The data word to be written to the memory is
strobed in next and the internal address pointer is
incremented to the next memory location within
the RAM on the reception of an acknowledge
clock. The M41ST84W slave receiver will send an
acknowledge clock to the master transmitter after
it has received the slave address (see Figure
9., page 10) and again after it has received the
word address and each data byte.
Data Retention Mode
With valid VCC applied, the M41ST84W can be ac-
cessed as described above with READ or WRITE
cycles. Should the supply voltage decay, the
M41ST84W will automatically deselect, write pro-
tecting itself when VCC falls between VPFD(max)
and VPFD(min). This is accomplished by internally
inhibiting access to the clock registers. At this
time, the Reset pin (RST) is driven active and will
remain active until VCC returns to nominal levels.
When VCC falls below the Battery Back-up
Switchover Voltage (VSO), power input is switched
from the VCC pin to the external battery, and the
clock registers and SRAM are maintained from the
attached battery supply.
All outputs become high impedance. On power up,
when VCC returns to a nominal value, write protec-
tion continues for trec. The RST signal also re-
mains
active
during
this
time
(see
For a further more detailed review of lifetime calcu-
lations, please see Application Note AN1012.
Figure 12. WRITE Mode Sequence
AI00591
BUS ACTIVITY:
ACK
S
ACK
STOP
START
P
SDA LINE
BUS ACTIVITY:
MASTER
R/W
DATA n
DATA n+1
DATA n+X
WORD
ADDRESS (An)
SLAVE
ADDRESS
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M41ST84WMQ6E | 功能描述:實(shí)時(shí)時(shí)鐘 Serial 512 (64x8) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| M41ST84WMQ6F | 功能描述:實(shí)時(shí)時(shí)鐘 Serial 512 (64x8) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| M41ST84WMQ6TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.0/3.3V I2C Serial RTC with Supervisory Functions |
| M41ST84WSH | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit 64 x 8 SERIAL RTC with SUPERVISORY FUNCTIONS |
| M41ST84Y | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit 64 x 8 SERIAL RTC with SUPERVISORY FUNCTIONS |
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