DRV2605EVM-BT Datasheet, PDF (5/34 Pages) TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS – evaluation kit for the DRV2605 ERM and LRA Haptic Driver.

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5 Hardware Overview
Hardware Overview
5.1 DRV2605 Haptic Driver
The DRV2605EVM-BT’s DRV2605 haptic driver is powered by onboard bq24232 battery management
chip. The DRV2605 is capable of driving ERM and LRA actuators. The BLE microcontroller's I2C, EN and
trigger pins are connected to the DRV2605. There are 123 library effects embedded inside the DRV2605.
The DRV2605 is configured to play LRA actuator waveforms on statup which can be configured differently
if needed. The DRV2605EVM-BT has optional pad to set into an external trigger mode to play a particular
pattern on an external microcontroller output trigger. An example of this is described in Section 5.11.
There are two capacitors: one for decoupling and the other for the internal regulator of the chip. The
rectangular bounding silkscreen around the DRV2605 on the DRV2605EVM-BT highlights the solution
size.
SDA
SCL
DRV_EN
DRV_TRIG ^R39
0
REG_VDD
R1 R8
10.0k 10.0k
U1
B2 _SDA
C1 _SCL
A1 _EN
B1 _IN/TRIG
VDD
VREG
OUT+
OUT-
GND
DRV2605YZF
Place Motor Pads
VBQOUT
VBAT
R38
0
C2
A2
A3
OUT+ _TP2
C3
OUT- _TP1
B3
GND
C2
0.1uF
GND
C3
1µF
GND
Figure 3. Smart Haptic Driver
5.2 BQ24232 Battery Management IC
The bq24232 is a USB-capable lithium-ion battery charger with dynamic power path management. This
chip is purely used in this application to manage the selection of the power supply between a battery pack
or a USB source. The battery management chip delivers power directly to the DRV2605 haptic driver and
the TPS63051 DC-DC buck-boost converter. Net VBQOUT is the output of the battery management chip.
SLOU391 – May 2014
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DRV2605EVM-BT User's Guide
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