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BQ3285LD Datasheet

  • BQ3285LD

  • Real-Time Clock (RTC)

  • 27頁

  • TI

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bq3285ED/LD
Real-Time Clock (RTC)
Features
廬
ACPI-compliant
day-of-month alarm
廬
Direct clock/calendar replace-
ment for IBM
廬
AT-compatible
computers and other applications
廬
2.7鈥?.5V operation (bq3285LD);
4.5鈥?.5V operation (bq3285ED)
廬
242 bytes of general nonvolatile
storage
廬
Dedicated 32.768kHz output pin
廬
System wake-up capability鈥?/div>
alarm interrupt output active in
battery-backup mode
廬
Less than 0.55碌A(chǔ) load under bat-
tery operation
廬
Selectable Intel or Motorola bus
timing
廬
24-pin plastic SSOP
General Description
The CMOS bq3285ED/LD is a low-
power microprocessor peripheral pro-
viding a time-of-day clock and 100-
year calendar with alarm features
and battery operation. The architec-
ture is based on the bq3285/7 RTC
with added features: low-voltage op-
eration, 32.768kHz output, 128 addi-
tional bytes of CMOS, and a day-of-
month alarm to be compliant with
the ACPI RTC specification.
A 32.768kHz output is available for
sustaining power-management ac-
tivities. The bq3285ED/LD 32kHz
output is always on whenever V
CC
is
valid. In V
CC
standby mode, the
32kHz is active, and the bq3285LD
typically draws 100碌A(chǔ) while the
bq3285ED typically draws 300碌A(chǔ).
Wake-up capability is provided by
an alarm interrupt, which is active
in battery-backup mode. In battery-
backup mode, current drain is less
than 550nA.
The bq3285ED/LD write-protects the
clock, calendar, and storage registers
during power failure. A backup
battery then maintains data and oper-
ates the clock and calendar.
The bq3285ED/LD is a fully com-
patible real-time clock for IBM AT-
compatible computers and other ap-
plications. The only external compo-
nents are a 32.768kHz crystal and a
backup battery.
The bq3285ED is intended for use in
5V systems. The bq3285LD is in-
tended for use in 3V systems; the
bq3285LD, however, may also oper-
ate at 5V and then go into a 3V
power-down state, write-protecting
as if in a 3V system.
Pin Connections
Pin Names
AD
0
鈥揂D
7
Multiplexed address/
data input/output
Bus type select input
RCL
CS
AS
DS
R/W
INT
RST
Chip select input
BC
Address strobe input
X1鈥揦2
Data strobe input
V
CC
Read/write input
V
SS
Interrupt request output
Reset input
Ground
Power supply
Crystal inputs
3V backup cell input
RAM clear input
32K
32.768kHz output
EXTRAM Extended RAM enable
MOT
X1
X2
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
VSS
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
VCC
32k
EXTRAM
RCL
BC
INT
RST
DS
VSS
R/W
AS
CS
MOT
24-Pin SSOP
PN3285ED/LD.eps
July 1997
1

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