Datasheet
DS3514
Applications Information
Power-Supply Decoupling
To achieve the best results when using the DS3514,
decouple all the power-supply pins (V
CC
and V
DD
) with
a 0.01µF or 0.1µF capacitor. Use a high-quality ceramic
surface-mount capacitor if possible. Surface-mount
components minimize lead inductance, which improves
performance, and ceramic capacitors tend to have
adequate high-frequency response for decoupling
applications.
SDA and SCL Pullup Resistors
SDA is an I/O with an open-collector output that
requires a pullup resistor to realize high-logic levels. A
master using either an open-collector output with a
pullup resistor or a push-pull output driver can be used
for SCL. Pullup resistor values should be chosen to
ensure that the rise and fall times listed in the
I
2
C
Electrical Characteristics
are within specification. A typ-
ical value for the pullup resistors is 4.7kΩ.
SLAVE
ADDRESS*
START
START
1 1 0 0 0 0 A0 R/W
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
MSB LSB MSB LSB MSB LSB
b7 b6 b5 b4 b3 b2 b1 b0
READ/
WRITE
REGISTER ADDRESS
b7 b6 b5 b4 b3 b2 b1 b0
DATA
STOP
SINGLE-BYTE WRITE
-WRITE LATCH A
GM8 TO 00h
SINGLE-BYTE WRITE
-ENTER STANDBY MODE
SINGLE-BYTE READ
-READ LATCH A GM2
TWO-BYTE WRITE
- WRITE 10h AND 11h TO 80h
START
REPEATED
START
C1h DATA
MASTER
NACK
STOP
1 1000000
00000 010
02h
11000 001
1 1000000
00001 000
C0h 08h OOh
STOP
START
1 1000000 01000001
C0h 41h
STOP
I/O STATUS
80h
EXAMPLE I
2
C TRANSACTIONS (WHEN A0 IS CONNECTED TO GND).
TYPICAL I
2
C WRITE TRANSACTION
*THE SLAVE ADDRESS IS DETERMINED BY ADDRESS PIN A0.
00000 000
1
000 0000
C0h
A)
C)
B)
D)
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
START
1 1000000 00010000
C0h 10h
STOP
80h
1
000 0000
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
80h
1
000 0000
SLAVE
ACK
TWO-BYTE READ
- READ 10h AND 11h
E)
START
1 1000000 00010000
C0h 10h
STOP
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
MASTER
ACK
C1h DATA DATA
1
100 0001
MASTER
NACK
REPEATED
START
Figure 6. I
2
C Communication Examples
I
2
C Gamma and V
COM
Buffer with EEPROM
______________________________________________________________________________________ 19