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LM27966SQ Folha de dados(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças LM27966SQ
Descrição Electrónicos  White LED Driver with I2C Compatible Interface
Download  13 Pages
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM27966SQ Folha de dados(HTML) 9 Page - National Semiconductor (TI)

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Circuit Description (Continued)
line during the 9th clock pulse, signifying an acknowledge.
The LM27966 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 LM27966
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 LM27966 is 0110110, or 36h.
INTERNAL REGISTERS OF LM27966
Register
Internal Hex
Address
Power On
Value
General Purpose
Register
10h
0010 0000
Main Display
Brightness Control
Register
A0h
1110 0000
Auxiliary LED
Brightness Control
Register
C0h
1111 1100
Note: EN-MAIN: Enables Dx LED drivers (Main Display)
T0: Must be set to ’0’
EN-AUX: Enables DAUX LED driver (Indicator Lighting)
EN-D5: Enables D5 LED voltage sense
T1: Must be set to ’0’
Note: Dx4-Dx0: Sets Brightness for Dx pins (Main Display). 11111=Fullscale
20190112
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 LM27966
20190109
FIGURE 4. Chip Address
20190108
FIGURE 5. General Purpose Register Description
Internal Hex Address: 10h
20190105
20190107
FIGURE 6. Brightness Control Register Description
Internal Hex Address: 0xA0 (Main Display), 0xC0
(D
AUX)
www.national.com
9


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