Datasheet
Maxim Integrated
│
80
MAX98090 Ultra-Low Power Stereo Audio Codec
www.maximintegrated.com
Table 1. MAX98090 Control Register Map (continued)
Software Reset
The device provides a software controlled reset (Table
2) that is used to return most registers to their default
(POR) states (the record biquad and playback parametric
equalizer coefficients are not reset). The software reset
register is a pushbutton, write only register. As a result,
a read of this register always returns 0x00. Writing logic-
high to SWRESET triggers a software register reset, while
writing a logic-low to SWRESET has no effect.
Table 2. Software Reset Register
REGISTER DESCRIPTION REGISTER CONTENTS
POR
STATE
ADDR NAME R/W BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
RECORD BIQUAD FILTER COEFFICIENT REGISTERS
0xAF
RECORD BIQUAD
COEFFICIENT B0
R/W REC_B0[23:16] —
0xB0 R/W REC_B0[15:8] —
0xB1 R/W REC_B0[7:0] —
0xB2
RECORD BIQUAD
COEFFICIENT B1
R/W REC_B1[23:16] —
0xB3 R/W REC_B1[15:8] —
0xB4 R/W REC_B1[7:0] —
0xB5
RECORD BIQUAD
COEFFICIENT B2
R/W REC_B2[23:16] —
0xB6 R/W REC_B2[15:8] —
0xB7 R/W REC_B2[7:0] —
0xB8
RECORD BIQUAD
COEFFICIENT A1
R/W REC_A1[23:16] —
0xB9 R/W REC_A1[15:8] —
0xBA R/W REC_A1[7:0] —
0xBB
RECORD BIQUAD
COEFFICIENT A2
R/W REC_A2[23:16] —
0xBC R/W REC_A2[15:8] —
0xBD R/W REC_A2[7:0] —
REVISION ID REGISTER
0xFF REVISION ID R REVID[7:0] 0x43
ADDRESS: 0x00
DESCRIPTION
BIT NAME TYPE POR
7 SWRESET W 0
Pushbutton Software Device Reset
0: Writing a logic low to SWRESET has no effect.
1: Reset all registers to their default POR values. This excludes the record biquad
and playback parametric equalizer lter coefcients (Table 30 and Table 52).
6 — — — —
5 — — — —
4 — — — —
3 — — — —
2 — — — —
1 — — — —
0 — — — —