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LM27964 Datasheet(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM27964
Description  White LED Driver System with I2C Compatible Brightness Control
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM27964 Datasheet(HTML) 9 Page - National Semiconductor (TI)

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Circuit Description (Continued)
The master releases the SDIO line (HIGH) during the ac-
knowledge clock pulse. The LM27964 pulls down the SDIO
line during the 9th clock pulse, signifying an acknowledge.
The LM27964 generates an acknowledge after each byte
has been received.
After the START condition, the I
2C master sends a chip
address. This address is seven bits long followed by an
eighth bit which is a data direction bit (R/W). The LM27964
address is 36h. For the eighth bit, a “0” indicates a WRITE
and a “1” indicates a READ. The second byte selects the
register to which the data will be written. The third byte
contains data to write to the selected register.
I
2C COMPATIBLE CHIP ADDRESS
The chip address for LM27964 is 0110110, or 36h.
INTERNAL REGISTERS OF LM27964
Register
Internal Hex
Address
Power On
Value
General Purpose
Register
10h
0000 0000
Bank A and Bank
B Birghtness
Control Register
A0h
0000 0000
KEYPAD
Brightness Control
B0h
0000 0000
Note: ENA: Enables DxA LED drivers (Main Display)
ENB: Enables DxB LED drivers (Sub Display)
ENK: Enables Keypad Driver
20138112
FIGURE 3. Write Cycle
w = write (SDIO = "0")
r = read (SDIO = "1")
ack = acknowledge (SDIO pulled down by either master or slave)
rs = repeated start
id = chip address, 36h for LM27964
20138109
FIGURE 4. Chip Address
20138108
FIGURE 5. General Purpose Register Description
Internal Hex Address: 10h
20138107
FIGURE 6. General Purpose Register Example
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