MAX97236EVKIT+ Maxim Integrated Products, MAX97236EVKIT+ Datasheet - Page 25

• Manufacturer Part Number: MAX97236EVKIT+
• Description: Audio Modules & Development Tools MAX97236 Eval Kit
• Manufacturer: Maxim Integrated Products

Specifications of MAX97236EVKIT+

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Table 12. Keyscan Delay Register
Table 13. Keyscan Data Register
The Keyscan Delay register sets the timeout that the microphone button press is masked from the system. At the end of
the delay time, the IC checks to see if a microphone is still present. If the microphone is present, the system is alerted
by setting the MCSW bit in the status register flagging an interrupt if IMCSW is set. If the microphone is not present
after the delay time, the system is flagged with an interrupt by setting MICROPHONE_IN signifying that the microphone
has been removed and no keypress was made.
The Keyscan Data register contains the data read from a keypress after the 6-bit ADC encodes the input voltage level.
The read keypress could come from a single switch or a passive multibutton device.
Keyscan Data
Passive MBH
REGISTER
(Read Only)
REGISTER
Keyscan
Delay
0x16
0x17
BIT
BIT
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Audio Amplifier with Jack Detection
KEYDATA
KEY_DEL
RANGE
PRESS
NAME
NAME
Keyscan Delay Register
Delay time set from 4ms to 1024ms in 4ms increments. The programmed code
plus one multiplied by 4ms represents the delay time.
e.g., code 0x63 represents 400ms of delay.
Release
Tells if a KEY status was PRESS or RELEASE.
0 = Key release.
1 = Keypress.
0 = Coarse range.
1 = Fine range.
Keyscan Data
B6–B0 are read-only bits that contain the data read from a passive keypress
that shorts the microphone to ground. There is a coarse range (10mV/LSB)
and a fine range (2mV/LSB). See Figure 7 and the Passive Multibutton Headset
(MBH) section.
t
DELAY
= (KEY_DEL + 1) x 4ms
Passive Multibutton Keyscan Data Register
DESCRIPTION
DESCRIPTION
Keyscan Delay Register
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