Datasheet

ADAU1761
Rev. C | Page 78 of 92
R40: Control Port Pad Control 0, 16,431 (0x402F)
The optional pull-up/pull-down resistors are nominally 250 k. When enabled, these pull-up/pull-down resistors set the control port
signals to a defined state when the signal source becomes three-state.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
CDATP[1:0] CLCHP[1:0] SCLP[1:0] SDAP[1:0]
Table 74. Control Port Pad Control 0 Register
Bits Bit Name Description
[7:6] CDATP[1:0] CDATA pad pull-up/pull-down configuration.
Setting Configuration
00 Pull-up
01 Reserved
10
None (default)
11
Pull-down
CLATCH
pad pull-up/pull-down configuration.
[5:4] CLCHP[1:0]
Setting Configuration
00 Pull-up
01 Reserved
10
None (default)
11
Pull-down
[3:2] SCLP[1:0] SCL/CCLK pad pull-up/pull-down configuration.
Setting Configuration
00 Pull-up
01 Reserved
10
None (default)
11
Pull-down
[1:0] SDAP[1:0] SDA/COUT pad pull-up/pull-down configuration.
Setting Configuration
00 Pull-up
01 Reserved
10
None (default)
11 Pull-down
R41: Control Port Pad Control 1, 16,432 (0x4030)
With IOVDD set to 3.3 V, the low and high drive strengths of the SDA/COUT pin are approximately 2.0 mA and 4.0 mA, respectively.
With IOVDD set to 1.8 V, the low and high drive strengths are approximately 0.8 mA and 1.7 mA, respectively. The high drive strength
mode may be useful for generating a stronger ACK pulse in I
2
C mode, if needed.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved SDASTR
Table 75. Control Port Pad Control 1 Register
Bits Bit Name Description
0 SDASTR SDA/COUT pin drive strength.
0 = low (default).
1 = high.