DRV201A Datasheet, PDF (19/25 Pages) Texas Instruments – VOICE COIL MOTOR DRIVER FOR CAMERA AUTO FOCUS

DRV201A
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MODE REGISTER (MODE)
Address – 0x06h
DATA BIT
D7
FIELD NAME
not used
READ/WRITE
R
RESET VALUE
0
D6
not used
R
0
D5
not used
R
0
SLVSBN6 – JUNE 2013
D4
D3
D2
PWM_FREQ[2:0]
R/W
R/W
R/W
0
0
0
D1
PWM/LIN
R/W
0
D0
RING_MOD
E
R/W
0
FIELD NAME
RING_MODE
PWM/LIN
PWM_FREQ[2:0]
BIT DEFINITION
Ringing compensation settling time
0 – 2x(1/f_VCM)
1 – 1x(1/f_VCM)
Driver output stage in linear or PWM mode
0 – PWM mode
1 – Linear mode
Output stage PWM switching frequency
000 – 0.5 MHz
001 – 1 MHz
010 – N/A
011 – 2 MHz
100 – N/A
101 – 4.8 MHz
110 – 6.0 MHz
111 – 4 MHz
VCM RESONANCE FREQUENCY REGISTER (VCM_FREQ)
Address – 0x07h
DATA BIT
FIELD NAME
D7
D6
D5
D4
D3
D2
D1
D0
VCM_FREQ[7:0]
READ/WRITE
R/W
RESET VALUE
1
0
0
0
0
0
1
1
FIELD NAME
VCM_FREQ[7:0]
BIT DEFINITION
VCM mechanical ringing frequency for the ringing compensation can be selected with the below
formula. The formula gives the VCM_FREQ[7:0] register value in decimal which should be rounded to
the nearest integer.
19200
VCM _ FREQ = 383 -
F_res
(1)
Default VCM mechanical ringing frequency is 76.4 Hz.
VCM _ FREQ = 383 - ¹⁹²⁰⁰ = 131.69 Þ 132 Þ '1000 0011'
76.4
(2)
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