MAX8738 Maxim Integrated Products, MAX8738 Datasheet - Page 10

• Manufacturer Part Number: MAX8738
• Description: EEPROM-Programmable TFT VCOM Calibrator
• Manufacturer: Maxim Integrated Products

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The MAX8738 is a receive-only device with an I
address of 5Eh. The 2-wire, I
interface (pins SCL and SDA) is designed to attach to a
I
bus supply through individual pullup resistors. Calculate
the required value of the pullup resistors using:
where t
acteristics, and C
bus.
Calibrator with I
Figure 5. Replacement of Mechanical Potentiometer Circuit
Figure 6. I
10
2
C bus. Connect both SCL and SDA lines to the positive
EEPROM-Programmable TFT VCOM
SDA
SCL
______________________________________________________________________________________
R
2
C Bus START, STOP, and Data Change Conditions
is the rise time in the Electrical Char-
CONDITION
START
POTENTIOMETER
Applications Information
S
MECHANICAL
R
R
R
I
R
D
E
F
BUS
2
AVDD
PULLUP
C-Bus-Compatible Interface
is the total capacitance on the
2
C-bus-compatible serial
C
BUS
t
R
DATA VALID
DATA LINE
STABLE
2
C Interface
VCOM
R1 = R
R2 = R
R
SET
ALLOWED
CHANGE
OF DATA
=
D
F
R
D
x (R
2
20 x R
C
D
+ R
E
E
+ R
F
The MAX8738 is compatible with the standard I
face protocol as defined in the following subsections.
See Figure 6.
The I
remain HIGH. Data transfers may be initiated only when
the bus is not busy.
Starting from an idle bus state (both SDA and SCL are
high), a START condition consists of a HIGH to LOW
transition of the SDA line while the clock (SCL) is HIGH.
All commands must be preceded by a START condition.
A STOP condition consists of a LOW to HIGH transition
of the SDA line while the clock (SCL) is HIGH. All oper-
ations must be ended with a STOP condition.
)
EQUIVALENT CIRCUIT
2
C bus is not busy when both data and clock lines
GND
MAX8738
MAX8738
R
SET
AVDD
OUT
SET
AVDD
R1
R2
START Data Transfer (S)
STOP Data Transfer (P)
CONDITION
STOP
P
VCOM
Bus Not Busy
2
C inter-