ST70235A

7/28

Note: Compensation cell - The COMP_OUT pin must be connected at GND by a 100K

Ω resistor on board.

Specifications of the resistor have to meet the following requirements:

± 5% allowed on the value, ±1% is preferred.

Advice is given to place the resistor so that there will be the shortest path between it and the pin.

Using the DISABLE_COMP signal is possible to disable the slew rate control of IOs, in this mode the IOs are however still functional,

but dynamic performances are affected.

An internal pull-down on DISABLE_COMP pin enables the slew rate control of IOs, an external pull-up resistor (connected at 3.3V)

must be inserted in order to disable the slew rate control.

121

PDOWN

O

BD4STARP

O

Power down analog front end (Reset)

122

VDD 3.3

(VSS + 3.3V) Power Supply

123

AFRXD_0

I

TLCHT

I

Receive data nibble

124

AFRXD_1

I

TLCHT

I

Receive data nibble

125

AFRXD_2

I

TLCHT

I

Receive data nibble

126

AFRXD_3

I

TLCHT

I

Receive data nibble

127

VSS

0V Ground

128

CLWD

I

TLCHT

I

Start of word indication

129

MCLK

I

TLCHT

C

Master clock

130

CTRLDATA

O

BD4STARP

O

Serial data Transmit channel

131

VDD 3.3

(VSS + 3.3V) Power Supply

132

COMP_VDD_1.8

COMP_1V60

Compensation Cell VDD 1.8V (see note 1)

133

COMP_ROUT

O

COMP_1V60

none

Compensation Cell Resistor (see note 1)

134

VSS

COMP_1V60

0V Ground

135

DISABLE_COMP

I

TLCHTDQ

Disable Compensation Cell (see note 1)

136

RESERVED

Reserved

137

VDD 1.8

(VSS + 1.8V) Power Supply

138

IDDq

I

TLCHT

none

Test pin, active high

139

AFTXD_0

O

BD8STARP

O

Transmit data nibble

140

AFTXD_1

O

BD8STARP

O

Transmit data nibble

141

VSS

0V Ground

142

AFTXD_2

O

BD8STARP

O

Transmit data nibble

143

AFTXD_3

O

BD8STARP

O

Transmit data nibble

144

VDD 3.3

(VSS + 3.3V) Power Supply

Table 1 : I/O Driver Function

Driver

Function

BD4STARP

TTL Three Volt capable Schmitt Trigger Bidirectional Pad Buffer, 4mA, with Test pins, with Active Slew

Rate Control

BD8STARP

TTL Three Volt capable Schmitt Trigger Bidirectional Pad Buffer, 8mA, with Test pins, with Active Slew

Rate Control

TLCHTDQ

TTL Three Volt capable Input Buffer with Active Pull-Down and Test pin

TLCHTUQ

TTL Three Volt capable Input Buffer with Active Pull-Up and Test pin

TLCHT

TLL Three Volt capable Input Pad Buffer

Pin

Name

Type

PAD Type

HCMOS7

BS

Function

PIN FUNCTIONS (continued)