SX8644EVK Semtech, SX8644EVK Datasheet - Page 22

Manufacturer Part Number

SX8644EVK

Description

Manufacturer

Semtech

Datasheet

1.SX8644EVK.pdf (76 pages)

Lead Free Status / RoHS Status

Not Compliant

SX8644

Ultra Low Power, Capacitive Button and Slider

Touch Controller (12 sensors) with Enhanced LED Drivers

ADVANCED COMMUNICATIONS & SENSING

DATASHEET

3.14 Reset

The reset can be performed by 3 sources:

- power up,

- RESETB pin,

- software reset.

3.14.1 Power up

During power up the INTB is kept low. Once the power up sequence is terminated the INTB is released

autonomously. The SX8644 is then ready for operation.

Power Up vs. INTB

Figure 21

During the power on period the SX8644 stabilizes the internal regulators, RC clocks and the firmware initializes all

registers.

During the power up the SX8644 is not accessible and I2C communications are forbidden.

As soon as the INTB rises the SX8644 will be ready for I2C communication.

3.14.2 RESETB

When RESETB is driven low the SX8644 will reset and start the power up sequence as soon as RESETB is

driven high or pulled high.

In case the user does not require a hardware reset control pin then the RESETB pin can be connected to VDD.

Hardware Reset

Figure 22

Revision 7_3, January 10