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CAT3211 Datasheet(PDF) 10 Page - ON Semiconductor

No. de pieza CAT3211
Descripción Electrónicos  Programmable Haptic Driver for Rotary DC Motors
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT3211 Datasheet(HTML) 10 Page - ON Semiconductor

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CAT3211
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Figure 14. Simplified Block Diagram
BASIC OPERATION
The CAT3211 contains six 8−bit registers controlled via
the I2C interface. On power−up, these registers are set to
their default values and can be modified to store the haptic
pulse timing durations, the oscillator configuration settings,
and the H−bridge regulator voltage levels in both haptic or
vibrate modes.
The internal haptic sequence generator is triggered on the
rising edge of H_TRIG. This allows direct connection from
a touch screen controller bypassing the CPU and improving
latency time from key−press to mechanical user feedback.
During the haptic mode, the voltage supply to the H−Bridge
can be programmed from 2.0 V to 5.0 V or shorted to VIN
via the LDOH register. This allows the motor to be safely
overdriven for short durations, greatly increasing the user
experience.
The device can be configured to drive the motor for a
standard incoming call by driving VIB_EN high. This mode
can driven safely for extended times since the LDO
regulated voltage to rotary motor can be programmed at safe
voltage levels via LDOV register.
The device can be fully shut down via the I2C interface to
prevent external systems from triggering or enabling any
modes by writing a zero into the CONFIG register
CHIP_EN bit (B0).
Haptic Mode Timers
The internal oscillator for the haptic mode timers are
selected by writing a zero into the OSC register EXT_OSC
bit. Writing a one into the EXT_OSC bit allows an external
oscillator to be used via OSC pin. The internal and external
clock can be further divided from 1 time to 128 times by
setting OSC_DIV_2, OSC_DIV_4 and OSC_DIV16
accordingly.
The haptic pulse timers are configured via the HAPTIC_A
and HAPTIC_B registers. Forward, Coast and Reverse
timers can be configured from 0 to 30 clock cycles in 2 cycle
increments. The Recovery timer can be configured from 0
to 60 clock cycles in 4 cycle increments. In order to prevent
the motor from being overdriven in haptic mode for
extended times, it is not possible to start a new haptic pulse
unless the recovery time has elapsed.
Protection
The device includes over−current protection on all
H−bridge switches to protect the POS and NEG pins from
damage and stops the VIN supply from dipping due to
excessive currents during fault conditions.
The device is designed to handle the inductive currents in
the rotor windings during direction transitions or power off
conditions without affecting operation of the device. A 1
mF
capacitor is required between REG and PGND to absorb
these current spikes.
In case the die temperature exceeds the thermal shutdown
temperature (TSD) of 140°C typical, the CONFIG register
TEMP_L bit (B3) is set to one automatically and
permanently (latched) until RST goes low. This information
can be retrieved by the system by reading the CONFIG
register at a later time. The TEMP_L bit is read−only.
Thermal shutdown and under−voltage lockout disable the
device if abnormal conditions are detected and dynamically
enable once the abnormal condition is removed.


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