User Manual

9570H–AT42–02/10

AT42QT1110-MZ/AT42QT1110-AZ

OUT_DETECTn: PWM to output when key n is “Out of Detect” (where n is 0–7). This PWM is

also output if the DETECT output is “disconnected” from the key (that is, “LED_n” in address 17

is set to 0), allowing the host to directly control the PWM output.

The values for the “IN_DETECTn” and “OUT_DETECTn” nibbles are listed in Table 7-12.

Default IN_DETECTn value: 8 (100% PWM – on)

Default OUT_DETECTn value: 0 (0% PWM – off)

7.13 Address 16: LED Detect Hold Time

When a key is touched, if the “Detect” outputs and “Key to LED” options are enabled (see

Section 7.12 and Section 7.14), the corresponding “Detect” pin will output its “In-Detect” PWM

signal.

After the key touch is removed, the “Detect” output can be held at the “In-Detect” PWM signal for

a time before returning to the “Out of Detect” PWM signal. This allows a reasonable length of

time for an LED to be illuminated. The length of this time is controlled by the LED Detect Hold

Time. Valid values are in multiples of 16 ms.

Default value: 0 (0 ms)

Table 7-12. PWM Values

Value Meaning

00%

1 12.5%

225%

3 37.5%

450%

5 62.5%

675%

7 87.5%

8 100%

Table 7-13. LED Detect Hold Time

Address Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

16 LED_DETECT_HOLD_TIME