CS48L32 datasheet(36/192 Pages) CIRRUS

36 / 192 page

Cirrus Logic

DS1219F4

CS48L32

4.2 Input Signal Path

The ultrasonic detection and demodulation control registers are described in Table 4-7.

Table 4-7. Ultrasonic Signal-Detect and Demodulation Control

Bit

Label

Default

Description

R47104 (0xB800)

US_CONTROL

US2_DET_EN

Ultrasonic Detect 2 Enable

0 = Disabled

1 = Enabled

US1_DET_EN

Ultrasonic Detect 1 Enable

0 = Disabled

1 = Enabled

US2_EN

Ultrasonic Demodulator 2 Enable

0 = Disabled

1 = Enabled

US1_EN

Ultrasonic Demodulator 1 Enable

0 = Disabled

1 = Enabled

R47108 (0xB804)

US1_CONTROL

13:12 US1_GAIN[1:0]

Ultrasonic Demodulator 1 Gain

00 = Disabled (no signal)

01 = –5 dB

10 = 1 dB

11 = 7 dB

11:8 US1_SRC[3:0]

0x0

Ultrasonic Demodulator 1 Source

0x0 = IN1L

0x1 = IN1R

0x2 = IN2L

0x3 = IN2R

All other codes are reserved

6:4

US1_FREQ[2:0]

011

Ultrasonic Demodulator 1 Frequency

010 = 16–24 kHz

011 = 20–28 kHz

All other codes are reserved

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