33784 datasheet(14/30 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33784

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

INPUT/OUTPUT PINS

There are three I/O pins on the 33784 that can serve as

either logic inputs or logic outputs. At power-up or after a

Clear Command, the pins default to inputs. They can be

individually configured as outputs as needed via the I/O

Control Command on the bus.

ADDRESSING

The 33784 may be connected in a daisy chain to other

DBUS devices. If this device is connected in a daisy chain,

then it will receive its 4-bit address during initialization on the

bus.

TEST MODE

The 33784 can be configured in a special test mode for

evaluation purposes. The test mode can only be entered if all

of the following conditions are true:

• The TEST1 pin is at a logic high level

• The correct test mode command is sent to the device on

the bus

• One of the internal test mode registers is accessed

Accessing the test mode registers and writing different

values to them can change the behavior of many of the pins

on the device, including the TOUT pin, which is only active in

test mode. The test mode can be intermixed with other bus

commands to evaluate the behavior of internal circuit blocks.

To prevent accidental activation of the test mode, the

TEST1 pin should be tied externally to AGND. The TOUT pin

should be grounded when not in TEST mode.

Table 5. 10-Bit ADC Value Mapping

Hex

Description

03FF

Prohibited

•

03F9

Prohibited

03F8

Error Code

03F7

Prohibited

•

03E4

Prohibited

03E3

G Range

•

0020

G Range

001F

Prohibited

•

0000

Prohibited

Table 6. 8-Bit ADC Value Mapping

Hex

Description

Prohibited

Error Code

Prohibited

••

Prohibited

G Range

••

G Range

Prohibited

••

Prohibited

Table 6. 8-Bit ADC Value Mapping

Hex

Description

33784 Datasheet(PDF) 14 Page - Freescale Semiconductor, Inc

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