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Continued from preceding page.
No.
Pin
28
MODE SELECT
29
RT-TIME
SET/DIMMER
19
CR OSC
17
VSS
30
VDD
18
TEST
27
50/60 Hz INPUT
Note: • "3I" is an abbreviation for "three value input pin." The inputs to these pins can be either high, open, or low. These pins are left open during normal use.
• NOP: "No operation"
Internal equivalent
I/O
circuit
3I
Input pin for switching the operating mode.
Switches the display mode and the clock input to the
VDD
50/60 Hz INPUT pin (pin 27).
High:
H
Open: 60 Hz/12 hour display
Low:
L
3I
Input pin for switching the enabled/disabled state for setting
H:
High threshold
the time.
input
L:
Low threshold
Normally left open.
input
High:
Open: Current time display/current time setting disabled
Low:
I/O
Connection pin for external RC circuit.
An oscillator circuit with a frequency of 4800 Hz can be
VDD
formed using the following R and C values.
R = 68 kΩ
C = 4700 pF
I
—
Power supply pins.
I
VSS = 0 V
VDD = +5 V (standard)
3I
LSI test pin.
Normally left open.
VDD
H
L
H:
High threshold
input
L:
Low threshold
input
I
Input pin for the 50/60 Hz input for the clock.
(Schmitt input)
LC85632
Pin function
50 Hz/24 hour display
50 Hz/12 hour display
Current time display/current time setting mode
Dimmed display/current time setting disabled
Handling when unused
Either left open, connected
to VDD, or connected to
ground.
Open
Connected to VDD
—
Open
No. 4659-5/34
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