DRV201 Datasheet, PDF (6/17 Pages) Texas Instruments – VOICE COIL MOTOR DRIVER FOR CAMERA AUTO FOCUS

DRV201
SLVSB25 – AUGUST 2011
MODES OF OPERATION
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SHUTDOWN
STANDBY
ACTIVE
If the driver detects SCL has a DC level below 0.63 V for duration of at least 0.5 ms, the
driver will enter shutdown mode. This is the lowest power mode of operation. The driver will
remain in shutdown for as long as SCL pin remain low.
If SCL goes from low to high the driver enters STANDBY mode and sets the default register
values. In this mode registers can be written to through the I²C interface. Device will be in
STANDBY mode when VCM_CURRENT register is set to zero. From ACTIVE mode the
device will enter STANDBY if the SW_RST bit of the CONTROL register is set. In this case
all registers will be reset to default values.
STANDBY mode is entered from ACTIVE mode if any of the following faults occur: Over
temperature protection fault (OTPF), VCM short (VCMS), or VCM open (VCMO). When
STANDBY mode is entered due to a fault condition current register is cleared.
The device is in ACTIVE mode whenever the VCM_CURRENT control is set to something
else than zero through the I²C interface. In ACTIVE mode VCM driver output stage is
enabled all the time resulting in higher power consumption. The device remains in active
mode until the SW_RST bit in the CONTROL register is set, SCL is pulled low for duration of
0.5 ms, VCM_CURRENT control is set to zero, or any of the following faults occur: Over
temperature protection fault (OTPF), VCM short (VCMS), or VCM open (VCMO). If active
mode is entered after fault the status register is automatically cleared.
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