DA7282-00FVC datasheet(42/77 Pages) DIALOG

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DA7282

LRA/ERM Ultra-Low Power Haptic Driver with Multiple

Input Triggers and Integrated Waveform Memory

Datasheet

Revision 3.0

30-Jul-2019

CFR0011-120-00

42 of 77

5.7.19

VDDIO/EN Pin Control

The VDDIO/EN pin controls the entry and exit of the device from OFF state. When VDDIO_EN = 0 V,

DA7282 is OFF and consumes typ. 5 nA of current from the VDD pin. Setting VDDIO_EN = VDDIO (the

system supply level) enables the device and, after the initial boot sequence, it will reach IDLE state

with typ. 680 nA of current consumption. Note that the device will have been hardware reset when it

comes out of the OFF mode.

For lowest OFF mode current consumption control the enable function via a host-side GPIO push-

pull that connects the VDDIO/EN pin either to GND or to the system VDDIO supply.

If the VDDIO/EN pin is only needed as a device hardware reset, where it will only be pulled low for a

short time (therefore IDLE state power consumption is not an issue), a possible system solution is to

use an open-drain output with a pull-up resistor to the system VDDIO supply. In this configuration a

larger pull-up resistor might require an additional capacitor.

For recommended configurations and component values for the two examples, see Figure 24 and

Table 17.

Host

GPIO

Driver

DA7282

GPIO

system VDDIO supply

GND

VDDIO/EN

Host

GPIO

Driver

DA7282

GPIO

system VDDIO supply

GND

VDDIO/EN

Open Drain GPIO

(for hardware reset function only)

Push-Pull GPIO

(for best OFF mode current consumption)

Figure 24: VDDIO/EN Pin Control in Push-Pull Configuration and Open Drain Configuration

Table 17: VDDIO/EN Pin Control Recommended Values of R and C

Pullup Resistor R

(kΩ)

Decoupling Capacitor C (pF)

< 200

None

0.2 to 2.2

100

2.2 to 10

1000

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