TSC2000IPW datasheet(17/34 Pages) TI

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TSC2000

SBAS257

DL1

DL0

DELAY TIME

µs

100

µs

500

µs

1000

µs

TABLE XVII. Reference Power-Up Delay Settings.

PDN

VALUE

DESCRIPTION

Internal Reference is Powered at All Times

Internal Reference is Powered Down Between Conversions

TABLE XVIII. PDN Bit Operation.

INT

PDN

REFERENCE BEHAVIOR

External Reference Used, Internal Reference Powered Down

External Reference Used, Interenal Reference Powered Down

Internal Reference Used, Always Powered Up

Internal Reference Used, Will Power Up During Conversions

and Then Power Down

TABLE XIX. Reference Behavior Possibilities.

MSB

LSB

BIT 15

BIT 14

BIT 13

BIT 12

BIT 11

BIT 10

BIT 9

BIT 8

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

PRE2

PRE1

PRE0

SNS2

SNS1

SNS0

TABLE XXI. Configuration Control Register.

PRE[2:0]

PRE2

PRE1

PRE0

TIME

µs

276

µs

340

µs

1.044ms

1.108ms

1.300ms

1.364ms

TABLE XXII. Precharge Times.

SNS[2:0]

SNS2

SNS1

SNS0

TIME

µs

544

µs

608

µs

2.080ms

2.144ms

2.592ms

2.656ms

TABLE XXIII. Sense Times.

RFV

VALUE

DESCRIPTION

1.25V Reference Voltage

2.5V Reference Voltage

TABLE XX. RFV Bit Operation.

Bit 1: PDN = Reference Power Down. If a 1 is written to this

bit, the internal reference will be powered down between

conversions. If this bit is a zero, the internal reference will be

powered at all times. The default state is to power down the

internal reference, so this bit will be a 1. This bit is the same

whether reading or writing.

Note that the PDN bit, in concert with the INT bit, creates a

few possibilities for reference behavior. These are detailed in

Table XIX.

Bit 0: RFV = Reference Voltage control. This bit selects the

internal reference voltage, either 1.25V or 2.5V. The default

value is 1.25V. This bit is the same whether reading or writing.

TSC2000 CONFIGURATION CONTROL REGISTER

(PAGE 1, ADDRESS 05H)

This control register controls the configuration of the precharge

and sense times for the touch detect circuit. The register is

formatted as shown in Table XXI.

Bits [5:3]: PRE[2:0] = Precharge Time Selection Bits. These

bits set the amount of time allowed for precharging any pin

capacitance on the touch screen prior to sensing if a screen

touch is happening.

Bits [2:0]: SNS[2:0] = Sense Time Selection Bits. These bits

set the amount of time the TSC2000 will wait to sense a

screen touch between coordinate axis conversions in

PENIRQ-controlled mode.

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