sm5128a1s Nippon Precision Circuits Inc, (NPC), sm5128a1s Datasheet - Page 10

• Manufacturer Part Number: sm5128a1s
• Description: Cb Transceiver System Lsi
• Manufacturer: Nippon Precision Circuits Inc, (NPC)

Input Pin Priority
The device operation for all possible input combina-
tions is determined by the active level of the inputs
using the following input pin priority.
CE > PA > EMG > UP > DN
CHO
CHO is the channel change confirmation tone output,
and indicates that the frequency changed due to
switching UP, DN, TR and EMG. The output signal
is a 2.5 kHz tone of approximately 51.2 ms duration.
LB
LB is the “LOW BATTERY” display indicator con-
trol input. The indicator is lit when LB is LOW or
open, and the indicator is OFF when LB is HIGH.
LB incorporates a pull-down resistor. The state of
LB does not affect PLL operation.
HL
HL is the “HIGH POWER” and “LOW POWER”
display indicators control input. The “HIGH
POWER” indicator is lit when HL is HIGH, and the
“LOW POWER” indicator is lit when HL is LOW or
open. HL incorporates a pull-down resistor. The state
of HL does not affect PLL operation.
PLL DATA
UP,DN
EMG
CHO
LD
DISCONTINUED
3.2 to 9.6ms
PRODUCT
SM5128A1
25.6ms
25.6ms
CH9
If a high priority pin goes LOW (active) while a
lower priority pin operation is in progress (from
when LD goes LOW until CHO output stops), the
operation stops and the higher priority pin operation
takes precedence.
NIPPON PRECISION CIRCUITS—10