33784 datasheet(20/30 Pages) FREESCALE

20 / 30 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

33784

FUNCTIONAL DEVICE OPERATION

LOGIC COMMANDS AND REGISTERS

Figure 11. Approximate ADC Conversion Timing

Figure 12. Request AN0 Command and Response Format

REQUEST AN1 COMMAND AND RESPONSE

This command causes the analog voltage on the AN1 pin

to be measured and converted by the on-chip 10-bit ADC.

The approximate timing for the conversion following this

command is shown in Figure 11, page 20. The response to

this command depends on the format in which the command

was sent. The sensor data is sent in the format shown in

Figure 12.

The 33784 will only act on this command if the address bits

in the command match the address that the device was

initialized with. If the addresses do not match, the device will

do nothing and no response will be generated.

Data

Address

Command

Word Type

––––––––

0010

LW & ELW

0010

SW & ESW (8-bit)

––

0010

ESW (10-bit)

Response

Word Type

0000

LW & ELW

SW & ESW (8-bit)

ESW (10-bit)

Legend

A[3:0] = Address bits. The address of the selected device.

An address value of 0000 is ignored by all devices.

“–” = Don’t care bit. Can be 0 or 1.

B[9:0] = Measured value.

BUSIN

Disabled

ADC

Conversion

Completed

Frame

Threshold

Conversion

Complete

End of

Request ANx

Command

ADC

Sampling

ADC

Enable

0.1

μs

4.4

μs

4.6

μs

13.6

μs

Not Sampling

Sampling

Enabled

1.6

μs

7.4

μs

All values are approximate and

are not production tested.

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