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BQ4847

更新时间: 2024-11-05 22:48:27
品牌 Logo 应用领域
德州仪器 - TI 监控
页数 文件大小 规格书
5页 224K
描述
RTC Module With CPU Supervisor

BQ4847 数据手册

 浏览型号BQ4847的Datasheet PDF文件第2页浏览型号BQ4847的Datasheet PDF文件第3页浏览型号BQ4847的Datasheet PDF文件第4页浏览型号BQ4847的Datasheet PDF文件第5页 
bq4847/bq4847Y  
RTC Module With CPU Supervisor  
tolerance to allow for power supply  
General Description  
Features  
and processor stabilization.  
Real-Time Clock counts seconds  
The bq4847 Real-Time Clock Mod-  
Th e bq4847 a ls o h a s a bu ilt -in  
ule is a low-power microprocessor  
through years in BCD format  
watchdog timer to monitor processor  
peripheral that integrates a time-  
Integrated battery and crystal  
operation. If the microprocessor does  
of-day clock, a 100-year calendar, a  
not toggle the watchdog input (WDI)  
CPU supervisor, a battery, and a crys-  
On-chip battery-backup switch-  
over circuit with nonvolatile con-  
trol for an external SRAM  
within the programmed time-out,  
tal in a 28-pin DIP module. The part  
the bq4847 asserts WDO and RST.  
is ideal for fax machines, copiers, in-  
WD I u n con n e ct e d d is a b le s t h e  
dustrial control systems, point-of-sale  
watchdog timer.  
130mAh battery capacity  
terminals, data loggers, and comput-  
ers.  
The bq4847 can generate other in-  
±1 minute per month clock accu-  
terrupts based on a clock alarm con-  
Th e bq4847 con t a in s a n in t er n a l  
racy  
dition or a periodic setting. The  
battery and crystal. Through the use  
Less than 500nA of clock opera-  
alarm interrupt can be set to occur  
of the conditional chip enable output  
tion current in backup mode  
from once per second to once per  
(CEOUT) and battery voltage output  
month. The alarm can be made ac-  
(VOUT) pin s, t h e bq4847 can write-  
Microprocessor reset valid to  
tive in the battery-backup mode to  
protect and make n on vola t ile a n  
VCC = VSS  
serve as a system wake-up call. For  
ext er n a l SRAM. Th e ba cku p cell  
interrupts at a rate beyond once per  
p ower s t h e r ea l-t im e clock a n d  
I n d ep en d en t wa t ch d og t im er  
with a programmable time-out  
period  
second, the periodic interrupt can be  
programmed with periods of 30.5µs  
to 500ms.  
m a in t a in s SRAM in for m a t ion in  
the absence of system voltage.  
Power-fail interrupt warning  
T h e  
b q 4 8 4 7  
con t a i n s  
a
t em per a t u r e-com pen sa t ed r efer-  
ence and comparator circuit that  
monitors the status of its voltage  
su pply. Wh en a n ou t -of-t oler a n ce  
condition is detected, the bq4847  
gen er a t es a n in t er r u pt wa r n in g  
a n d su bsequ en t ly a m icr opr oces-  
sor r eset . Th e r eset st a ys a ct ive  
for 200m s a ft er VCC r ises wit h in  
Programmable clock alarm inter-  
r u pt a ct ive in ba t t er y-ba cku p  
mode  
Caution:  
Take care to avoid inadvertent dis-  
charge through VOUT and CEOUT  
after battery isolation has been  
broken.  
Programmable periodic interrupt  
Battery-low warning  
Pin Connections  
Pin Names  
A0–A3  
Clock/Control address  
inputs  
NC  
No connect  
V
28  
1
V
OUT  
NC  
NC  
CC  
WE  
27  
26  
2
3
VOUT  
INT  
Back-up battery output  
Interrupt output  
Microprocessor reset  
Watchdog input  
Watchdog output  
+5V supply  
CE  
CE  
NC  
IN  
DQ0–DQ7 Data inputs/outputs  
4
WDO  
INT  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
OUT  
5
WE  
OE  
Write enable  
RST  
6
WDI  
OE  
CS  
RST  
WDI  
WDO  
VCC  
VSS  
A
3
7
Output enable  
Chip select input  
A
A
A
8
9
2
1
0
NC  
10  
11  
12  
13  
14  
DQ  
7
DQ  
DQ  
DQ  
DQ  
CS  
DQ  
0
1
2
6
DQ  
DQ  
5
4
3
CEIN  
External RAM chip  
enable  
V
SS  
Ground  
CEOUT  
Conditional RAM chip  
enable  
28-Pin DIP Module  
PN484701.eps  
Sept. 1996  
1

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