RESET

Device

State

Nor a

m l

erai n

Op

t o

Resetting

InitialCondition

t

200n

³

WL(RESET)

s

SDA

SCL

1

0

0

1

0

0

A0

R/W

0

0

1

0

1

1

0

X

X

0

TSC2017

ACK

TSC2017

ACK

AddressByte

SetupCommand

1

Software

ResetIssued

START

t

D(RESET)

200ns

³

TSC2017

www.ti.com

SBAS472 – DECEMBER 2009

RESET FUNCTION

The reset function is controlled by the SureSet™ control logic (SSC). There are three methods to reset the

device: hardware reset, software reset, and power-on reset (POR).

Hardware Reset

Hardware system reset can be performed using the RESET pin. After hardware reset, the device returns to the

default configuration and all the settings in the control byte are reset to the default values (see Table 2 and

Table 4). To ensure proper reset, the reset pulse width must have a duration of greater than 200ns. Note that a

pulse width of less than 200ns will have unexpected results. See Figure 35 for the external reset timing diagram.

Figure 35. External Reset Timing

Software Reset

The TSC2017 has a software reset that can be issued by loading the Setup comand with '1011 01xx' via I2C, as

shown in Figure 36. After software reset, the device returns to the default configuration and all the settings in the

control byte are reset to the default values (see Table 2 and Table 4).

Figure 36. Software Reset Timing

Copyright © 2009, Texas Instruments Incorporated

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