ICM7170 Intersil Corporation, ICM7170 Datasheet - Page 6

• Manufacturer Part Number: ICM7170
• Description: Microprocessor-compatible, Real-time Clock
• Manufacturer: Intersil Corporation

Timing Diagrams
Pin Descriptions
WR
ALE
CS
A4-A0
OSC OUT
OSC IN
INT SOURCE
INTERRUPT
V
V
D0 - D7
V
RD
D5
0
1
A0 - A4, D0 - D7, CS
SS
BACKUP
DD
n/a
(GND)
D7
Normal Mode
Test Mode
TEST BIT
SIGNAL
ALE
WR
D6
n/a
D4
0
1
(Continued)
FIGURE 4. WRITE CYCLE TIMING FOR MULTIPLEXED BUS (RD = V
Interrupt disabled
Normal/Test
Interrupt enable
COMMAND REGISTER ADDRESS (10001b, 11h) WRITE-ONLY
INTERRUPT
PIN NUMBER
Mode
ENABLE
D5
ADDRESS VALID, CS LOW
TABLE 2. COMMAND REGISTER BIT ASSIGNMENTS
15 - 22
4 - 8
10
11
12
13
14
23
24
2
3
9
1
t
TABLE 1. COMMAND REGISTER FORMAT
LL
t
AL
t
AD
Interrupt
Enable
D3
0
1
D4
ICM7170
RUN/STOP
PIN NUMBER
12-10
Stop
Run
22 - 2
9 - 16
SOIC
20
21
17
18
19
3
4
5
6
7
8
Run/Stop
D3
t
LA
D2
0
1
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
INPUT DATA VALID
12-Hour Mode
24-Hour Mode
24/12 HOUR
12/24 Hour
t
WL
FORMAT
t
Format
DW
D2
IH
DESCRIPTION
t
CYC
)
Frequency
D1
0
0
1
1
t
Crystal
WA
D1
D0
t
0
1
0
1
WD
1.048576MHZ
2.097152MHz
4.194304MHz
FREQUENCY
32.768kHz
CRYSTAL
Frequency
Crystal
D0