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BQ4847YMT

更新时间： 2024-02-16 14:16:12

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

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技术参数
数据手册

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BQ4847YMT 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Obsolete	包装说明：	DIP, DIP28,.6
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.84
外部数据总线宽度：	8	信息访问方法：	PARALLEL, DIRECT ADDRESS
中断能力：	Y	JESD-30 代码：	R-XDMA-T28
端子数量：	28	计时器数量：
最高工作温度：	70 °C	最低工作温度：
封装主体材料：	UNSPECIFIED	封装代码：	DIP
封装等效代码：	DIP28,.6	封装形状：	RECTANGULAR
封装形式：	MICROELECTRONIC ASSEMBLY	峰值回流温度（摄氏度）：	NOT SPECIFIED
电源：	5 V	认证状态：	Not Qualified
子类别：	Timer or RTC	最大供电电压：	5.5 V
最小供电电压：	4.5 V	标称供电电压：	5 V
表面贴装：	NO	技术：	CMOS
温度等级：	COMMERCIAL	端子形式：	THROUGH-HOLE
端子节距：	2.54 mm	端子位置：	DUAL
最短时间：	SECONDS	处于峰值回流温度下的最长时间：	NOT SPECIFIED
易失性：	NO	uPs/uCs/外围集成电路类型：	TIMER, REAL TIME CLOCK
Base Number Matches：	1

BQ4847YMT 数据手册

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

(CE_OUT) and battery voltage output

month. The alarm can be made ac-

(V_OUT) 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

V_CC= V_SS

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

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 V_CCr 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 V_OUTand CE_OUT

after battery isolation has been

broken.

➤ Programmable periodic interrupt

➤ Battery-low warning

Pin Connections

Pin Names

A₀–A₃

Clock/Control address

inputs

No connect

OUT

V_OUT

INT

Back-up battery output

Interrupt output

Microprocessor reset

Watchdog input

Watchdog output

+5V supply

DQ₀–DQ₇Data inputs/outputs

WDO

INT

OUT

Write enable

RST

WDI

RST

WDI

WDO

V_CC

V_SS

Output enable

Chip select input

CE_IN

External RAM chip

enable

Ground

CE_OUT

Conditional RAM chip

enable

28-Pin DIP Module

PN484701.eps

Sept. 1996

12 3 4 5

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