Analog Integrated Circuit Device Data

Freescale Semiconductor

3

33784

PIN CONNECTIONS

PIN CONNECTIONS

Figure 3. 33784 Pin Connections

Table 1. 33784 Pin Definitions

A functional description of each pin can be found in the Functional Pin Description section beginning on page 10.

Pin Number

Pin Name

Pin

Function

Formal Name

Definition

1

REGOUT

Output

Regulator

Output

Pin provides a regulated 5.0V output. The power is derived from the bus.

2

TEST2

Test

Test2

This pin must be grounded in the application.

3

4

5

I/O0

I/O1

I/O2

Input/Output

Logic I/O

Pins can be used to provide a logic level output or a logic input.

6, 8

AN0,AN1

Input

Analog Input

Inputs to the ADC.

7

AGND

Ground

Reference

Analog Ground

Pin is the low reference level and power return for the analog-to-digital

converter (ADC). It is internally connected to RTNIN.

9

TEST1

Test

Test1

This pin must be grounded in the application.

10

IDDQ

Test

IDDQ

Input pin for measuring device quiescent current. Must be left open in the

application.

11

TOUT

Test

Test Output

This pin must be grounded in the application.

12

RTNOUT

Power

Bus Return

Switched RTNIN pin, attaches to the next RTNIN pin in the daisy chain.

13

RTNIN

Power

Bus Return

Pin attaches to the low side of the differential bus, and provides the common

return for power and signalling. It is internally connected to AGND.

14

BUSOUT

Output

DBUS Output

Switched BUSIN Pin, attaches to the next BUSIN pin in the daisy chain.

15

BUSIN

Input

DBUS Input

Pin attaches to the high side of the differential bus and responds to

initialization commands.

16

H_CAP

Output

Holding

Capacitor

A capacitor attached to this pin is charged by the bus during bus idle and

supplies current to run the device and for external devices via the REGOUT

pin during non-idle periods.

REGOUT

TEST2

I/O0

I/O1

I/O2

AN0

AGND

AN1

H_CAP

BUSIN

BUSOUT

RTNIN

RTNOUT

TOUT

IDDQ

TEST1

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9