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参数资料
| 型号： | L6254 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | DISK DRIVE MOTOR CONTROLLER, 2.1 A, PQFP44 |
| 封装： | 10 X 10 MM, TQFP-44 |
| 文件页数： | 16/17页 |
| 文件大小： | 170K |
| 代理商： | L6254 |
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.
INSTRUCTION, 1 BIT
ADDRESS, 7 BITS
D98IN845
DATA, 8 BITS
SDEN
SCLK
SDATA
Figure 2. Serial Port Data Transfer Format.
INTERNAL REGISTER DEFINITION
Reg:
Name:
Type:
Address:
0
VCM DAC (High) Register
Write only
0Eh
BIT
LABEL
DESCRIPTION
0
VDAC BIT8
VCM DAC bit 8
1
VDAC BIT9
VCM DAC bit 9
2
VDAC BIT10
VCM DAC bit 10
3
VDAC BIT11
VCM DAC bit 11
4
VDAC BIT12
VCM DAC bit 12
5
VDAC BIT13
MSB resistor ladder of the 14 bit VCM DAC
6
PSM/LINEAR
Selects Voice Coil PSM or Linear Output Current Control. 1=PSM
0=Linear.
7
VCM_CAL
VCM calibration. 1 = Enables VCM control circuits and tristates
VCM power transistors.
L6254
8/17
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