ICM7170 Datasheet, PDF (7/14 Pages) Intersil Corporation – Microprocessor-Compatible, Real-Time Clock

ICM7170
ICM7170
Pin Descriptions
SIGNAL
WR
ALE
CS
A4-A0
OSC OUT
OSC IN
INT SOURCE
INTERRUPT
V_SS (GND)
V_BACKUP
D0 - D7
V_DD
RD
PIN NUMBER
1
2
3
4-8
9
10
11
12
13
14
15 - 22
23
24
SOIC PIN NUMBER
19
20
21
22 - 2
3
4
5
6
7
8
9 - 16
17
18
DESCRIPTION
Write Input
Address Latch Enable Input
Chip Select Input
Address Inputs
Oscillator Output
Oscillator Input
Interrupt Source
Interrupt Output
Digital Common
Battery Negative Side
Data I/O
Positive Digital Supply
Read Input
TABLE 1. COMMAND REGISTER FORMAT
COMMAND REGISTER ADDRESS (10001b, 11h) WRITE-ONLY
D7
D6
D5
D4
D3
D2
D1
D0
n/a
n/a
Normal/Test
Interrupt
Run/Stop
12/24 Hour
Crystal
Crystal
Mode
Enable
Format
Frequency
Frequency
TABLE 2. COMMAND REGISTER BIT ASSIGNMENTS
INTERRUPT
24/12 HOUR
D5
TEST BIT
D4
ENABLE
D3 RUN/STOP D2
FORMAT
0
Normal Mode
0
Interrupt disabled
0
Stop
0
12-Hour Mode
1
Test Mode
1
Interrupt enable
1
Run
1
24-Hour Mode
D1 D0
0
0
0
1
1
0
1
1
CRYSTAL
FREQUENCY
32.768kHz
1.048576MHZ
2.097152MHz
4.194304MHz
TABLE 3. ADDRESS CODES AND FUNCTIONS
ADDRESS
A4 A3 A2 A1 A0 HEX
FUNCTION
0
0
0
0
0
00 Counter-1/100 seconds
DATA
D7 D6 D5 D4 D3 D2 D1 D0 VALUE
-
0 - 99
0
0
0
0
1
01 Counter-hours
12 Hour Mode
-
-
-
†
-
-
-
0 - 23
1 - 12
0
0
0
1
0
02 Counter-minutes
-
-
0 - 59
0
0
0
1
1
03 Counter-seconds
-
-
0 - 59
0
0
1
0
0
04 Counter-month
-
-
-
-
1 - 12
0
0
1
0
1
05 Counter-date
-
-
-
1 - 31
0
0
1
1
0
06 Counter-year
-
0 - 99
0
0
1
1
1
07 Counter-day of week
-
-
-
-
-
0-6
0
1
0
0
0
08 RAM-1/100 seconds
M
0 - 99
0
1
0
0
1
09 RAM-hours
12 Hour Mode
-
M
-
†
M
-
-
0 - 23
1 - 12
0
1
0
1
0
0A RAM-minutes
M
-
.
.
0 - 59
0
1
0
1
1
0B RAM-seconds
M
-
.
.
0 - 59
0
1
1
0
0
0C RAM-month
M
-
-
-
1 - 12
0
1
1
0
1
0D RAM-date
M
-
-
1 - 31
0
1
1
1
0
0E RAM-year
M
0 - 99
6
Specification Number ICM7170_IM (IL) REV -
Page 7 of 14