MAX16816 Datasheet, PDF (25/33 Pages) Maxim Integrated Products – Programmable Switch-Mode LED Driver with Analog-Controlled PWM Dimming

Programmable Switch-Mode LED Driver
with Analog-Controlled PWM Dimming
sequence begins. All EEPROM bits are copied to the
EEPROM from the scratchpad with a single
SET_WRITE_EE command. This command also sets an
internal BUSY flag to mask all other incoming signals.
SET_WRITE_SCH: The SET_WRITE_SCH command
transfers data to the scratchpad. The 4 MSBs contain the
register address and the 4 LSBs contain the data to be
written. The internal BUSY flag is not set by this com-
mand. Table 11 shows the MAX16816 EEPROM memory
organization. Use the SET_WRITE_EE command to trans-
fer data from the scratchpad to the EEPROM.
SET_READ_SCH: The SET_READ_SCH command is
the command to read data in the scratch pad buffer.
Once the MAX16816 receives the SET_READ_SCH
command, data on the scratchpad register is shifted
out. After 60 clock cycles, the MAX16816 completes
the SET_READ_SCH sequence. The BUSY signal is not
set by this command.
Programming
To program the MAX16816 on-chip EEPROM with a
pulldown device, directly connect FAULT to the DATA
IN input of a microcontroller (µC). Also, connect FAULT
to the DATA OUT output of a µC using an external
switch (Figure 5). Connect the EN of the µC directly to
UVEN to control the internal timer of the MAX16816 for
programming purposes. Ensure that V_CC is greater
than the UVLO threshold because both UVEN and
FAULT are pulled up to 5V. See the Electrical
Characteristic tables for details.
EN
μC
READ
DATA IN
WRITE
DATA OUT
V_CC
UVEN
MAX16816
FAULT
Figure 5. Programming Through a FAULT Pin
Table 11. MAX16816 Memory Map (Scratchpad)
SCRATCHPAD
ADDRESS
1h
2h
3h
4h
5h
6h–9h
Ah
Bh
Ch
Dh
Eh
Fh
EEPROM ADDRESS
REGISTER
Reserved
Reserved
Reserved
Reserved
Reserved
14h–23h
24h–27h
28h–2Bh
2Ch–2Fh
30h–33h
34h–37h
38h–3Bh
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Binning Adjustment Register
REG2 Control Register
Reserved
Blanking Time Adjustment Register
Digital Soft-Start Duration Register, Internal Oscillator Enable Bit
Slope Compensation Register
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