MAX16805_07 Datasheet, PDF (13/19 Pages) Maxim Integrated Products – EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback

EEPROM-Programmable, High-Voltage, 350mA
LED Drivers with LED Current Foldback
Message Format
Write to the MAX16805/MAX16806 by transmitting the
device’s slave address with R/W, 8th bit set to zero fol-
lowed by at least 1 byte of information (Figure 7). The
first byte of information is the command byte. The bytes
received after the command byte are the data bytes.
The first data byte goes into the internal register as
selected by the command byte (Figure 8). If there is
more than one data byte, the MAX16805/MAX16806
auto-increment to the next register address locations to
write the subsequent data bytes. The MAX16805/
MAX16806 auto-increment up to the register address
0x05, EEPROM Content Transfer register.
A read operation is performed as follows:
After the START condition (S), a 7-bit slave ID is sent
followed by an 8th bit (R/W) set to zero. A register
address is then sent to specify the address location
from which the read has to take place. To complete a
read operation, the master needs to generate a repeat-
ed START (Sr) followed by the 7-bit slave ID but with
the 8th bit (R/W) set to "1" this time indicating a read
operation. On the other hand, a read operation can be
performed by sending in the 7-bit slave ID followed by
Table 2. Registers Address
REGISTER NAME
Binning Adjustment
Ramp Peak
LED Current Foldback
Threshold (LED_CFT)
Thermal Foldback Knee Point
Thermal Foldback Slope
Gain
Thermal Foldback Clamp
Level
EEPROM Content Transfer
EEPROM Program Enable
Password Register
REGISTER
ADDRESS
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x08
0xFF
NO. OF BITS/
REGISTER
4
3
4
4
2
3
—
—
—
an 8th bit (R/W) set to "1" if the current address location
happens to be the address location from which data
needs to be read.
ACKNOWLEDGE FROM
MAX16805/MAX16806
S
SLAVE ADDRESS
0A
COMMAND BYTE
A
P
RW
Figure 7. Command Byte Received
ACKNOWLEDGE FROM
MAX16805/MAX16806
ACKNOWLEDGE FROM
MAX16805/MAX16806
ACKNOWLEDGE FROM
MAX16805/MAX16806
S
SLAVE ADDRESS
0A
COMMAND BYTE
A
RW
Figure 8. Command and a Single Data Byte Received
ACKNOWLEDGE FROM
MAX16805/MAX16806
DATA BYTE
1 BYTE
AP
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