MSM6242B
APPLICATION NOTE
1. Power Supply
¡ Semiconductor
START
Power On
TEST Bit ← 0
REST Bit ← 0
24/12 Bit ← 1*
STOP Bit ← 1
REST Bit ← 0
24/12 Bit ← 2*
Set the current
time
HOLD Bit ← 0
STOP Bit ← 0
Start Operation
VDD = 5V
STD.P
Output = undifined
1* = 2*
(1 or 0)
2. Adjustment of Frequency
VDD
Screwdriver
18 17 16
VDD XT XT
CD, CF = (0, 0, 0, 0)
CE = (t1, t0, 0, 0)
SDT.P
VDD
123
d
c
Frequency
counter
Eye
CD ~ CF are to be set at as described in the
figure and the capacitor is to be adjusted
to meet the settle frequency of t0 and t1.
If the right oscillation can not be obtained,
1. Check the waveform of XT
2. Check CD ~ CF content
3. Check the noise
b
2
0.1 INCH
1
VDD XT XT
1 ≥ 0.3 INCH
a
2 ≥ 0.2 INCH
a b : INHIBIT
38