sm1125abv Nippon Precision Circuits Inc, (NPC), sm1125abv Datasheet - Page 7

• Manufacturer Part Number: sm1125abv
• Description: Multimelody Pagers
• Manufacturer: Nippon Precision Circuits Inc, (NPC)

TYPICAL APPLICATION
OSCILLATOR FREQUENCY MEASUREMENT
The measurement circuit below shows a SM1125ABV with built-in RC oscillator circuit and external RC
oscillator components capacitor C
When ST is switched to V
using a frequency counter.
Note that the board mounting and wiring will marginally affect the output frequency, even for equivalent values for R
CONTROLLER
Switch
DD
R
C
, the oscillator starts and outputs a pulse on MTO. The output pulse is counted
O
O
O
2.0 to 3.6V
C
91kΩ
R
and resistor R
O
O
91kΩ
200pF
OSC
SI
SC
ST
SM1125ABV
SM1125ABV
O
.
TEST
MTO
V
V
OSC
SI
SC
ST
DD
SS
TEST
MTO
VSS
V
DD
Frequency Counter
SEIKO NPC CORPORATION —7
B +
O
and C
O
.