MSM6242B 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM6242B

DIRECT BUS CONNECTED CMOS REAL TIME CLOCK/CALENDAR

Oki Electric Industry 

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

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