AD7992 datasheet(21/21 Pages) AD

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AD7992

–21–

REV. PrH

PRELIMINARYTECHNICAL DATA

Mode 3 - Automatic Cycle Mode

An automatic conversion cycle can be selected and enabled

by writing a value to the Cycle Timer Register. A conver-

sion cycle interval can be set up on the AD7992 by pro-

gramming the relevant bits in the 3-bit Cycle Timer

Timer register is programmed with any configuration

other than all 0’s, a conversion will take place every X ms,

depending on the configuration of these bits in the Cycle

Timer Register. There are 7 different cycle time intervals

to choose from as shown in Table XIIb. Once the conver-

sion has taken place the part powers down again until the

next conversion occurs. To exit this mode of operation the

user must program the Cycle Timer Register to contain

all 0’s. For cycle interval options see Table XIIb Cycle

Timer Intervals.

Figure 18. Mode 2 Sequence Operation

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

10-Lead MSOP (RM-10)

0.0197 (0.50)

BSC

0.122 (3.10)

0.114 (2.90)

0.199 (5.05)

0.187 (4.75)

0.122 (3.10)

0.114 (2.90)

0.012 (0.30)

0.006 (0.15)

0.037 (0.94)

0.031 (0.78)

SEATING

PLANE

0.120 (3.05)

0.112 (2.85)

0.043 (1.10)

MAX

0.006 (0.15)

0.002 (0.05)

0.028 (0.70)

0.016 (0.40)

0.009 (0.23)

0.005 (0.13)

0.120 (3.05)

0.112 (2.85)

To select channel(s) for operation in the cycle mode set

the corresponding channel(s) bits, D5 and D4, in the

Configuration Register. If both D5 and D4 are set to 1 in

the Configuration register, the ADC will automatically

cycle through the Channels, starting with the lowest chan-

nel and working its way up through the sequence. Once

the sequence is complete the ADC will start converting on

the lowest channel again, continuing to loop through the

sequence until the Cycle timer register contents are set to

all 0’s. This mode is useful for monitoring signals, e.g.

battery voltage, temperature etc, alerting only when the

limits are violated.

SCL

7-BIT ADDRESS

WA COMMAND/ADDRESS POINT BYTE A

SDA

FIRST DATA BYTE (MSBs)

SECOND DATA BYTE (LSBs)

7-BIT ADDRESS

SDA

SCL

ACK BY

AD7992

ACK BY

AD7992

ACK BY

AD7992

ACK BY

MASTER

FIRST DATA BYTE (MSBs)

SECOND DATA BYTE (LSBs)

ACK BY

MASTER

ACK BY

MASTER

RESULT FROM CH1

RESULT FROM CH2

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