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[7] Acquisition of brightness information
S1F76680 can read brightness information (brightness 1 to 16) as data.
Read data from address 00H with I
Brightness information will be output as 4-bit information of D7, D6, D5, D4 (register name: X3, X2, X1,
X0) as follows:
Brightness 1 = (D7,D6,D5,D4,D3,D2,D1,D0) = (0,0,0,0,X,X,X,X)
Brightness 2 = (D7,D6,D5,D4,D3,D2,D1,D0) = (0,0,0,1,X,X,X,X)
Brightness 16 (D7,D6,D5,D4,D3,D2,D1,D0) = (1,1,1,1,X,X,X,X)
Setting of register-based fixed current
S1F76680 allows lighting LED forcibly at a fixed current value without resorting to brightness of the
environment.
Just like the current setting in the automatic luminescence control, set this fixed current based on the
following
formula and using 7 bits from D0 (LSB) to D6 (MSB) at address 01H. D7 is the dummy.
Note that setting of SLED (0 to 3) lights off LED.
To drive LED at this imperative fixed current value, set D2 register (register name: NLED) of address 00H to
NLED = "1."
2
7.4 I
C slave function
S1F76680 incorporates a I
driver, whose LED's current value can change according to the ambient brightness.
By sending specific commands to the I
advanced setting of the white LED driver.
2
I
C basic specifications
The basic operation is complied with "I
[Address]
[Pins being used]
[Voltage level]
Register map is shown below:
S1F76680 Technical Manual (Rev.1.22)
Downloaded from
Elcodis.com
electronic components distributor
7. OPERATIONAL AND FUNCTIONAL DESCRIPTION
2
C, which will be explained later.
ILED(mA)=ILEDmax × SLED / 127
2
C-Bus controller with slave function, to enhance operability of the white LED
2
C controller, you can read / write data in a register, and thus, perform
2
C-BUS SPECIFICATION VERSION2.1" of Philips.
7-bit length
Slave address 1010100X
SCL Clock input pin
SDA Data I/O pin
V
level
DDL
EPSON
17
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