DRV2605L Datasheet, PDF(30/69 Page) Texas Instruments – DRV2605L 2 to 5.2 V Haptic Driver for LRA and ERM With Effect Library and Smart-Loop Architecture

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DRV2605L Datasheet, PDF (30/69 Pages) Texas Instruments – DRV2605L 2 to 5.2 V Haptic Driver for LRA and ERM With Effect Library and Smart-Loop Architecture

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DRV2605L

SLOS854C â MAY 2014 â REVISED SEPTEMBER 2014

www.ti.com

Programming (continued)

8.5.8.1.3 Closed-Loop Mode, Bidirectional

In closed-loop bidirectional mode, the DRV2605L device provides automatic overdrive and braking for both ERM

and LRA devices. This mode preserves compatibility with data created in open-loop signaling by maintaining

zero drive-strength at the mid-scale value. When input values less than the mid-scale value are given, the

DRV2605L device interprets them as the same as the mid-scale with zero drive.

The reference level for steady-state full-scale drive is set by the RATED_VOLTAGE[7:0] bit (when auto

calibration is performed). The output voltage can momentarily exceed the rated voltage for automatic overdrive

and braking, but does not exceed the OD_CLAMP[7:0] voltage. Braking occurs automatically based on the input

signal when the back-EMF feedback determines that braking is necessary. Although this mode preserves

compatibility with existing device data formats, it provides closed loop benefits and is the default configuration at

power up.

The RTP mode has 8 bits of resolution over the I2C bus. The RTP data can either be in signed (2s complement)

or unsigned format as defined by the DATA_FORMAT_RTP bit.

Steady-State

Output Magnitude Closed Loop, BIDIR_INPUT = 1

RATED_VOLTAGE[7:0]

Â½ RATED_VOLTAGE[7:0]

Full Braking

Input Interface

PWM

RTP (8-bit) DATA_FORMAT_RTP = 0 0x81

RTP (8-bit) DATA_FORMAT_RTP = 1 0x00

Figure 28.

50%

0x00

0x7F

75%

0x3F

0xBF

Input

100%

0x7F

0xFF

NOTE

This mode is compatible with all DRV2605L interfaces except for TS2200 Library A (with

fixed overdrive programming). Library A should only be used in open-loop mode. Libraries

B through F (no overdrive) can take advantage of the automatic overdrive and braking of

this mode.

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