Table 3-1 Control Commands

Commands are divided into two types: Control commands, which force the device into various modes or are used for serial communications management, and Status commands

which report back with information about the device or the sensing process.

Used in normal running mode to calibrate one specific key.

Normal sensing of other keys not affected. Calibration

takes place in the key’s normal timeslot. Returns 0xF8 to

acknowledge command was received and the requested

calibration will take place.

0xF8

1

2

Force calibration of key #k where k= 0..9

Command must be repeated 2 times within 100ms to

execute or it will fail.

CAL key ‘k’

18

0x1k

Returns 0xFA to acknowledge command; sleeps in low

power mode, wakes on WAKE pin; returns 0x05 after wake.

0xFA + 0x05

2

2

Enter sleep. Command must be repeated 2 times within

100ms to execute or it will fail.

SLEEP

18

0x05

Returns 0xFB to acknowledge command, then resets

device. After reset, part restarts, recalibrates, and runs

automatically (same as any other type of reset).

0xFB

1

2

Force device to reset. Sends back ‘0xFB’ to

acknowledge prior to reset. Command must be

repeated 2 times within 100ms to execute or it will fail.

RESET

18

0x04

Returns 0xFC after second 0x03 is received.

Check on progress of each key using 0x8k commands.

0xFC

1

2

Force device to enter Cal mode to recalibrate all keys;

enters RUN mode afterwards automatically. Command

must be repeated 2 times within 100ms to execute or it

will fail.

CAL ALL

18

0x03

Returns 0xFD after the second 0x02 is received.

0xFD

1

2

Enter RUN mode without benefit of calibration.

Command must be repeated 2 times within 100ms to

execute or it will fail.

RUN

18

0x02

Returns 0x53 after second 0x01 is received.

During or after block load; returns 0xFE if pass, or, 0xF0 if

CRC fail, or, 0xF1 if 100ms timeout between bytes, or,

0xF2 if EEPROM programming failed.

0x53 +

0xFE, 0xF0,

0xF1, 0xF2

2

2

Enter Setups mode and stop sensing, followed by block

load of binary Setups data from host. Command must

be repeated 2 times within 100ms or it will fail. Returns

with 0x53 when ready to accept block.

SETUPS

17

0x01

SPI mode: Flushes pending data from QT1100A.

UART mode: Serves no function and evokes no response

0..0xFF

1 in SPI

0 in UART

1

Used to get data back in SPI mode

NULL

16

0x00

Notes

Return

Range

Bytes

Returned

Bytes per

Command

Description

Name

Page

Hex

23

Copyright © 2003-2005 QRG Ltd

QT1100A-ISG R3.02/1105