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參數(shù)資料
| 型號(hào)： | BQ4847MT |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 1/7頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC RTC W/NVSRAM CONTROL T-MOD |
| 產(chǎn)品培訓(xùn)模塊： | Clock Basics in 10 minutes or less |
| 標(biāo)準(zhǔn)包裝： | 13 |
| 類型： | 時(shí)鐘/日歷 |
| 特點(diǎn)： | 警報(bào)器，夏令時(shí)，閏年，監(jiān)控器，監(jiān)視計(jì)時(shí)器 |
| 時(shí)間格式： | HH:MM:SS（12/24 小時(shí)） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | 并聯(lián) |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 電壓 - 電源，電池： | 2.3 V ~ 4 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 28-DIP 模塊（0.61"，15.49mm） |
| 供應(yīng)商設(shè)備封裝： | 28-DIP 模塊（18.42x38.8） |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1077 (CN2011-ZH PDF) |
| 其它名稱： | 296-6541-5 |
Features
Real-Time Clock counts seconds
through years in BCD format
Integrated battery and crystal
On-chip battery-backup switch-
over circuit with nonvolatile con-
trol for an external SRAM
130mAh battery capacity
±1 minute per month clock accu-
racy
Less than 500nA of clock opera-
tion current in backup mode
Microprocessor reset valid to
VCC =VSS
Independent watchdog timer
with a programmable time-out
period
Power-fail interrupt warning
Programmable clock alarm inter-
rupt active in battery-backup
mode
Programmable periodic interrupt
Battery-low warning
General Description
The bq4847 Real-Time Clock Mod-
ule is a low-power microprocessor
peripheral that integrates a time-
of-day clock, a 100-year calendar, a
CPU supervisor, a battery, and a crys-
tal in a 28-pin DIP module. The part
is ideal for fax machines, copiers, in-
dustrial control systems, point-of-sale
terminals, data loggers, and comput-
ers.
The bq4847 contains an internal
battery and crystal. Through the use
of the conditional chip enable output
(CEOUT) and battery voltage output
(VOUT) pins, the bq4847 can write-
protect and make nonvolatile an
external SRAM. The backup cell
powers the real-time clock and
maintains SRAM information in
the absence of system voltage.
The
bq4847
contains
a
temperature-compensated refer-
ence and comparator circuit that
monitors the status of its voltage
supply. When an out-of-tolerance
condition is detected, the bq4847
generates an interrupt warning
and subsequently a microproces-
sor reset. The reset stays active
for 200ms after VCC rises within
tolerance to allow for power supply
and processor stabilization.
The bq4847 also has a built-in
watchdog timer to monitor processor
operation. If the microprocessor does
not toggle the watchdog input (WDI)
within the programmed time-out,
the bq4847 asserts WDO and RST.
WDI unconnected disables the
watchdog timer.
The bq4847 can generate other in-
terrupts based on a clock alarm con-
dition or a periodic setting.
The
alarm interrupt can be set to occur
from once per second to once per
month. The alarm can be made ac-
tive in the battery-backup mode to
serve as a system wake-up call. For
interrupts at a rate beyond once per
second, the periodic interrupt can be
programmed with periods of 30.5
s
to 500ms.
1
bq4847/bq4847Y
1
PN484701.eps
28-Pin DIP Module
2
3
4
5
6
7
8
28
27
26
25
24
23
22
21
9
10
20
19
11
12
18
17
13
14
16
15
VCC
WE
CEIN
CEOUT
NC
WDI
OE
CS
NC
DQ7
DQ6
DQ5
DQ4
DQ3
VOUT
NC
WDO
INT
RST
A3
A2
A1
A0
DQ0
DQ1
DQ2
VSS
Pin Connections
A0–A3
Clock/Control address
inputs
DQ0–DQ7
Data inputs/outputs
WE
Write enable
OE
Output enable
CS
Chip select input
CEIN
External RAM chip
enable
CEOUT
Conditional RAM chip
enable
Pin Names
NC
No connect
VOUT
Back-up battery output
INT
Interrupt output
RST
Microprocessor reset
WDI
Watchdog input
WDO
Watchdog output
VCC
+5V supply
VSS
Ground
RTC Module With CPU Supervisor
Caution:
Take care to avoid inadvertent dis-
charge through VOUT and CEOUT
after battery isolation has been
broken.
Sept. 1996
Not Recommended For New Designs
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BQ4847-MT | 制造商:TI 制造商全稱:Texas Instruments 功能描述:RTC Module With CPU Supervisor |
| BQ4847Y | 制造商:TI 制造商全稱:Texas Instruments 功能描述:RTC Module With CPU Supervisor |
| BQ4847YMT | 功能描述:實(shí)時(shí)時(shí)鐘 RTC with NVSRAM 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 |
| BQ4847Y-MT | 制造商:TI 制造商全稱:Texas Instruments 功能描述:RTC Module With CPU Supervisor |
| BQ4850Y | 制造商:TI 制造商全稱:Texas Instruments 功能描述:RTC Module With 512Kx8 NVSRAM |
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