L6269 データシートの表示（PDF） - STMicroelectronics
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L6269 Datasheet PDF : 17 Pages
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L6269
SERIAL PORT OPERATION
The serial port interface is a bi-directional port for reading and writing programming data from/to the in-
ternal registers of this device. For data transfers SDEN* is brought high, serial data is presented at the
SDATA pin, and a serial clock is applied to the SCLK pin. After the SDEN* goes high , the first 16 pulses
applied to the SCLK pin will shift the data presented at the SDATA pin into an internal shift register on
the rising edge of each clock. An internal counter prevents more than 16 bits from being shifted into the
register. The data in the shift register is latched after the 16th SCLK pulse. If less than 16 clock pulses
are provided before SDEN* goes low, the data transfer is aborted.
All transfers are shifted into the serial port LSB first. The first byte of the transfer is for R/W and address
and instruction information. The first bit is R/W instruction bit, 0 is for WRITE and 1 is for READ.
Following 7 bits are Address.
Figure 2. Serial Port Data Transfer Format.
SDEN
SDATA
SCLK
INSTRUCTION, 1 BIT
ADDRESS, 7 BITS
DATA, 8 BITS
D98IN845
INTERNAL REGISTER DEFINITION
Reg:
Name:
Type:
Address:
0
VCM DAC (High) Register
Write only
0Eh
BIT
0
1
2
3
4
5
6
7
LABEL
VDAC BIT8
VDAC BIT9
VDAC BIT10
VDAC BIT11
VDAC BIT12
VDAC BIT13
PSM/LINEAR
VCM_CAL
DESCRIPTION
VCM DAC bit 8
VCM DAC bit 9
VCM DAC bit 10
VCM DAC bit 11
VCM DAC bit 12
MSB resistor ladder of the 14 bit VCM DAC
Selects Voice Coil PSM or Linear Output Current Control. 1=PSM
0=Linear.
VCM calibration. 1 = Enables VCM control circuits and tristates
VCM power transistors.
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