DRV2605 Demonstration Program
2.3
ROM Library Mode
ROM library effects can be accessed by holding the "+" button until the mode LEDs flash and colored
LEDs flash once.
Once in "Library Mode," the DRV2605 embedded ROM effects can be accessed in sequential order. For
example, with all mode LEDs off, B1 is waveform 1, B2 is waveform 2, and so on. Then when mode LED
M0 is on, B1 is waveform 5, B2 is waveform 6, and so on.
The equations for calculating the mode and button of an effect are:
Mode = RoundDown([Effect No.] / 4)
Button = ([Effect No.] - 1) % 4 + 1
% - is the modulo operator
To change between the 5 ERM libraries and 1 LRA library:
1. Select mode 31 (11111'b) using the "+" or "–" buttons.
•
B1 – Press repeatedly to access ROM libraries 1 through 5. The current library flashes on the
mode LEDs
•
B2 – Press to select the LRA ROM library
2. Then use the ROM effects as described previously
Each ERM library was designed for specific actuator behavior.
describes the actuator properties
that are best suited for each library. Note that the rated and overdrive voltages can be changed using the
rated and overdrive clamp registers in the DRV2605. The most important parameters to characterize with
your actuator are the rise and brake times.
Table 3. DRV2605 Library Table
Actuator Properties
Number
Library
Rated Voltage (V)
Overdrive Voltage (V)
Rise Time (ms)
Brake Time (ms)
1
Library A
1.3
3
40 – 60
20 – 40
2
Library B
3
3
40 – 60
5 – 15
3
Library C
3
3
60 – 80
10 – 20
4
Library D
3
3
100 – 140
15 – 25
5
Library E
3
3
>140
>30
12
DRV2605EVM-CT ERM and LRA Haptic Driver Evaluation Kit
SLOU348B – January 2013 – Revised March 2014
Copyright © 2013–2014, Texas Instruments Incorporated