參數(shù)資料
型號(hào)： AT42QT1111-AU
廠商： ATMEL CORP
元件分類： 速度傳感器和接近開關(guān)
英文描述： PROXIMITY SENSOR-CAPACITIVE, 0-5V, SQUARE, SURFACE MOUNT
封裝： 7 X 7 MM, 1 MM HEIGHT, 0.80 MM PITCH, ROHS COMPLIANT, PLASTIC, MS-026ABA, TQFP-32
文件頁(yè)數(shù)： 8/50頁(yè)
文件大?。?/td> 637K
代理商： AT42QT1111-AU
16
9571B–AT42–08/10
AT42QT1111-MU/AT42QT1111-AU
4.1.6
Quick SPI Mode
4.1.6.1
Introduction
In Quick SPI Mode, the QT1111 sends a 7-byte key report at each exchange. No host
commands are required over SPI in this mode; the host clocks the data bytes out in sequence.
Quick SPI mode is enabled by setting the “SPI_EN” bit in the Comms Options setup byte (see
4.1.6.2
Quick SPI Report
The 7 report bytes are in the format given in Table 4-1.
where:
Byte 0 is a counter that increments from 0 to 254 on successive exchanges to confirm that
firmware is operating correctly.
Bytes 1 – 3 indicate the detect status of channels 0 – 3, 4 – 7 and 8 – 10 respectively (two
bits per channel), as follows:
– 00 = Channel not in detect
– 01 = Channel in detect
– 10 = Not Allowed
– 11 = Invalid Signal (Channel disabled)
Bytes 4 – 6 indicate the error status of channels 0 – 3, 4 – 7 and 8 – 10 respectively (two bits
per channel), as follows:
–00 = No error
– 01 = Not allowed
– 10 = Error on channel
– 11 = Invalid signal (channel disabled)
Successive byte exchanges in Quick SPI mode cycle through the 7 bytes of status information. If
synchronization is lost, the host must either re-synchronize by identifying the incrementing
counter byte (byte 0) or pausing communications for at least 100 ms so the QT1111 will reset its
SPI state.
Table 4-1.
Device Status Report Format
Byte
Description
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
Counter
Counter – increments from 0 to 255
1
Detect status, channels 0 – 3
Channel 3
Channel 2
Channel 1
Channel 0
2
Detect status, channels 4 – 7
Channel 7
Channel 6
Channel 5
Channel 4
3
Detect status, channels 8 – 10
Reserved
Channel 10
Channel 9
Channel 8
4
Error status, channels 0 – 3
Channel 3
Channel 2
Channel 1
Channel 0
5
Error status, channels 4 – 7
Channel 7
Channel 6
Channel 5
Channel 4
6
Error status, channels 8 – 10
Reserved
Channel 10
Channel 9
Channel 8
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