Cirrus Logic CS4234 - Manual (Page 7)

DS899F1 7
CS4234
1.1 I/O Pin Characteristics
Input and output levels and associated power supply voltage are shown in the table below. Logic levels
should not exceed the corresponding power supply voltage.
Notes:
1. Internal connection valid when device is in reset.
2. This pin has no internal pull-up or pull-down resistors. External pull-up or pull-down resistors should
be added in accordance with Figure 2 .
VBIAS 24 Positive Voltage Reference (Output) - Positive reference voltage for the internal DACs.
AOUTx-
25,27,29,
31, 33
Negative Analog Output (Output) - Negative output signals from the internal digital to analog con-
verters. The full scale analog output level is specified in the
Analog Output Characteristics table.
AOUTx+
26,28,30,
32, 34
Positive Analog Output (Output) - Positive output signals from the internal digital to analog con-
verters. The full scale analog output level is specified in the
Analog Output Characteristics table.
RST 35 Reset (Input) - Applies reset to the internal circuitry when pulled low.
INT 36 Interrupt (Output) - Sent to DSP to indicate an interrupt condition occurred.
AD2/SDOUT2 37
I²C Address Bit 2/Serial Data Output 2 (Input/Output) - Sets the I²C address bit 2 at reset. Func-
tions as Serial Data Out 2 for AIN3 and AIN4 ADC data output in Left Justified and I²S modes. High
impedance in TDM mode. See
Section 4.3 I²C Control Port for more details concerning this mode of
operation.
AD1 38 I²C Address Bit 1 (Input) - Sets the I²C address bit 1.
AD0 39 I²C Address Bit 0 (Input) - Sets the I²C address bit 0.
SCL 40 Serial Control Port Clock (Input) - Serial clock for the I²C control port.
GND -
Thermal Pad - The thermal pad on the bottom of the device should be connected to the ground
plane via an array of vias.
Power Supply Pin Name I/O Driver
Internal Connections
(Note 1)
Receiver
VL
SCL Input - Weak Pull-down (~500k  5.0 V CMOS, with Hysteresis
SDA Input/Output
CMOS/Open
Drain
Weak Pull-down (~500k  5.0 V CMOS, with Hysteresis
INT Output
CMOS/Open
Drain
(Note 2) -
RST Input - (Note 2) 5.0 V CMOS, with Hysteresis
MCLK Input - Weak Pull-down (~500k  5.0 V CMOS, with Hysteresis
FS/LRCK Input/Output 5.0 V CMOS- Weak Pull-down (~500k  5.0 V CMOS, with Hysteresis
SCLK Input/Output 5.0 V CMOS- Weak Pull-down (~500k  5.0 V CMOS, with Hysteresis
SDOUT1 Output 5.0 V CMOS Weak Pull-down (~500k 
SDINx Input - Weak Pull-down (~500k  5.0 V CMOS, with Hysteresis
AD0,1 Input - (Note 2) 5.0 V CMOS
AD2/SDOUT2 Input/Output 5.0 V CMOS- (Note 2) 5.0 V CMOS
Pin Name Pin # Pin Description