RESET

Power-On Reset

1.2Vto3.6V

0.9V

0.3V

0V

VDD

t

VDD_OFF_RAMP

t

VDD_OFF

t

VDD_ON_RAMP

t

DEVICE_READY

TSC2008

The TSC2008 can be reset with three different methods: power-on reset (POR), software reset, and the

proprietary SureSet function. The configuration bits (see Table 3, bit[3:1]) accessible through the setup command

('010') are reset to the respective default values listed in Table 3 after any reset occurs (POR, software reset, or

SureSet).

During TSC2008 power up, an internal power-on reset (POR) is triggered if the power-supply ramping meets the

timing requirements shown in Figure 35 and listed in Table 8. The POR brings the TSC2008 to the default

working condition.

Figure 35. Power-On Reset Timing

Table 8. Timing Requirements for Figure 35

PARAMETER

TEST CONDITIONS

MIN

MAX

UNIT

2

kV/s

1

s

0.3

s

12

kV/s

2

ms

If the system is not able to meet the power ramping timing requirements, or if the system is not properly reset

(even after a POR), then including the SureSet reset in the initialization routine is recommended.

Copyright © 2008, Texas Instruments Incorporated

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Product Folder Link(s): TSC2008