TSC2017

www.ti.com

SBAS472 – DECEMBER 2009

When the TSC2017 powers up, the power-down bits must be written to ensure that the device is placed into the

mode that achieves the lowest power. Therefore, immediately after power-up, send a command byte that sets

PD1 = PD0 = 0, so that the device is in the lowest power mode, powering down between conversions.

Table 3. Converter Function Select

INPUT TO

A/D

REFERENCE

C3

C2

C1

C0

FUNCTION

CONVERTER

X-DRIVERS

Y-DRIVERS

ACK

MODE

0

0

0

0

Measure TEMP0

TEMP0

OFF

OFF

Y

Single-Ended

0

0

0

1

Reserved

N/A

OFF

OFF

N

Single-Ended

0

0

1

0

Measure AUX

AUX

OFF

OFF

Y

Single-Ended

0

0

1

1

Reserved

N/A

OFF

OFF

N

Single-Ended

0

1

0

0

Measure TEMP1

TEMP1

OFF

OFF

Y

Single-Ended

0

1

0

1

Reserved

N/A

OFF

OFF

N

Single-Ended

0

1

1

0

Reserved

N/A

OFF

OFF

N

Single-Ended

0

1

1

1

Reserved

N/A

OFF

OFF

N

Single-Ended

1

0

0

0

Activate X– drivers

N/A

ON

OFF

Y

Differential

1

0

0

1

Activate Y– drivers

N/A

OFF

ON

Y

Differential

1

0

1

0

Activate Y+, X– drivers

N/A

X– ON

Y+ ON

Y

Differential

1

0

1

1

Setup command(1)

N/A

OFF

OFF

Y

N/A

1

1

0

0

Measure X position

Y+

ON

OFF

Y

Differential

1

1

0

1

Measure Y position

X+

OFF

ON

Y

Differential

1

1

1

0

Measure Z1 position

X+

X– ON

Y+ ON

Y

Differential

1

1

1

1

Measure Z2 position

Y–

X– ON

Y+ ON

Y

Differential

(1)

The setup command has an additional four bits of data. These data are static; that is, they are not changed by other commands, except

for the power-on reset. The default value for these bits after power-on reset is 0000. Table 4 shows the definition of these data bits.

Table 4. Command Byte Definition for the Setup Command

BIT

NAME

DESCRIPTION

D7-D4

C3-C0 = '1011'

Setup command; must write '1011'.

D3

Reserved

Reserved; must write '0'.

0: Normal operation, not reset.

D2

Software reset

1: Reset all registers to default values (this bit is self-clearing).

0: Use the onboard MAV filter (default).

D1

Filter control

1: Bypass the onboard MAV filter.

0: RIRQ = 50kΩ (default).

D0

PENIRQ pull-up resistor (RIRQ) select

1: RIRQ = 90kΩ.

Copyright © 2009, Texas Instruments Incorporated

Submit Documentation Feedback

25

Product Folder Link(s): TSC2017