Pin Functions
Internal equivalent
No.
Pin
I/O
circuit
Pin function
Handling when unused
1
AM & PM
O
LED output pins
Open
2
10’SHRag & d
O
3
10’SHRb & e
O
4
10’SHRc & HRe
O
5
HRb & g
O
6
HRc & d
O
7
HRa & f
O
8
10’SMIN a & f
O
9
10’SMIN b & g
O
10
10’SMIN c & d
O
11
10’SMINe & MINe
O
12
MIN b & g
O
13
MIN c & d
O
14
MIN a & f
O
15
COLON
O
16
ALM INDICATOR
O
(VDD – 15 V breakdown voltage)
22
RADIO OUTPUT
O
Outputs a DC voltage. This pin is controlled by the inputs to
Open
the MANUAL & SLEEP pin (pin 26). It operates as a toggle.
During normal operation it outputs a low level (high
impedance).
(Normal breakdown voltage)
23
ALM-A OUTPUT
O
Output alarm signals
Open
24
ALM-B OUTPUT
O
ALM-A OUTPUT: Alarm A
ALM-B OUTPUT: Alarm B
The output waveform is shown below.
During normal operation these pins output a low level
(high impedance).
(Normal breakdown voltage)
Continued on next page.
LC85632
No. 4659-3/34
No.
Pin
Drive phase 1
Drive phase 2
1
AM & PM
AM
PM
2
10’SHR ag & d
10’SHR ad
10’SHR g
3
10’SHRb & e
10’SHR e
10’SHR b
4
10’SHRc & HRe
HR e
10’SHR c
5
HRb & g
HR g
HR b
6
HRc & d
HR d
HR c
7
HRa & f
HR f
HR a
8
10’SMIN a & f
10’SMIN a
10’SMIN f
9
10’SMIN b & g
10’SMIN b
10’SMIN g
10
10’SMIN c & d
10’SMIN c
10’SMIN d
11
10’SMINe & MINe
MIN e
10’SMIN e
12
MIN b & g
MIN g
MIN b
13
MIN c & d
MIN d
MIN c
14
MIN a & f
MIN f
MIN a
15
COLON
COLON
—
16
ALM INDICATOR
ALM-A
ALM-B
VDD
VDD
MANUAL & SLEEP pin input level
VDD
OPEN
VSS
VSS
RADIO OUT pin output level (when pulled down to VSS)
VDD
ALM-A OUTPUT and ALM-B OUTPUT pin output levels
(summary diagram)
* ALM-A OUTPUT (2400 Hz)
VDD
VSS
Output start
VSS
* ALM-B OUTPUT (1200 Hz)
VDD
VDD
