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ADAU1761BCPZ-R7 数据表(PDF) 79 Page - Analog Devices |
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ADAU1761BCPZ-R7 数据表(HTML) 79 Page - Analog Devices |
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79 / 93 page ![]() 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 kΩ. 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 I2C 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. |
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