DS1089L 데이터 시트보기 (PDF) - Maxim Integrated
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DS1089L Datasheet PDF : 13 Pages
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DS1089L
3.3V Center Spread-Spectrum EconOscillator™
SDA
tBUF
SCL
STOP
START
tLOW
tHD:STA
Figure 5. I2C AC Characteristics
tR
tF
tHD:STA
tHD:DAT
tHIGH
tSU:DAT
tSU:STA
REPEATED
START
tSP
tSU:STO
TYPICAL I2C WRITE TRANSACTION
MSB
LSB
MSB
LSB
MSB
LSB
START 1
0
1
1
A2*
A1*
A0* R/W
SLAVE
ACK
b7
b6
b5
b4
b3
b2
b1
b0
SLAVE
ACK
b7
b6
b5
b4
b3
b2
b1
b0
SLAVE
ACK
STOP
DEVICE IDENTIFIER DEVICE READ/
ADDRESS WRITE
COMMAND/REGISTER ADDRESS
DATA
EXAMPLE I2C TRANSACTIONS (WHEN A0, A1, AND A2 ARE ZERO)
B0h
02h
DATA
A) SINGLE BYTE WRITE
-WRITE PRESCALER
START 1 0 11 0 0 0 0
SLAVE
ACK
00000010
SLAVE
ACK
10000000
REGISTER TO 128
SLAVE
ACK
STOP
B) SINGLE BYTE READ
-READ PRESCALER
REGISTER
B0h
02h
B1h
DATA
START 1 0 11 0 0 0 0
SLAVE
ACK
00000010
SLAVE
ACK
REPEATED
START
10110001
SLAVE
ACK
10000000
MASTER
NACK
STOP
*THE ADDRESS DETERMINED BY A0, A1, AND A2 MUST
MATCH THE ADDRESS SET IN THE ADDR REGISTER.
Figure 6. I2C Transactions
Applications Information
Power-Supply Decoupling
To achieve the best results when using the DS1089L,
decouple the power supply with 0.01µF and 0.1µF
high-quality, ceramic, surface-mount capacitors.
Surface-mount components minimize lead inductance,
which improves performance, and ceramic capacitors
tend to have adequate high-frequency response for
decoupling applications. These capacitors should be
placed as close to the VCC and GND pins as possible.
Stand-Alone Mode
SCL and SDA cannot be left floating even in stand-alone
mode. If the DS1089L will never need to be programmed
in-circuit, including during production testing, SDA and
SCL can be connected high.
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