MAX1153_10 datasheet(19/30 Pages) MAXIM

19 / 30 page

Stand-Alone, 10-Channel, 10-Bit System Monitors

with Internal Temperature Sensor and VDD Monitor

___________________________________________________

Setup Register

The 8-bit setup register (Table 7) holds configuration

data common to all input channels. At power-up and

after a RESET command, this register defaults to

00000000b.

Setup Register: Sample Wait Bits (B7, B6, B5)

These 3 bits in the setup register (Table 8) set the wait

time between conversion scans. The following are

examples of how the MAX1153/MAX1154 begin a sam-

ple sequence (see the

Setup Register: Reference

Selection Bits (B1/B0) section).

Operating in reference mode 00 (external reference for

voltage conversions, internal reference for temperature

conversions):

1) Convert the first-enabled channel. If this channel is

a temperature measurement, power up the internal

reference (this takes 20µs for each enabled tem-

perature measurement in reference mode 00).

2) Sequence to the next-enabled channel until all

channels have been converted.

3) Wait the sample wait period.

4) Repeat the procedure.

Operating in reference mode 01 (internal reference for all

conversions, can be powered down between scans):

1) Power up the internal reference, if powered down

(this takes 40µs).

2) Convert the first-enabled channel, starting with the

internal temperature sensor, if enabled.

3) Sequence to the next-enabled channel until all

enabled channels have been converted.

4) Wait the sample wait time, and enter internal refer-

ence power-down mode if this period is greater

than 80µs.

5) Repeat the above steps.

Operating in reference mode 10 (internal reference for

all conversions, continuously powered up):

1) Convert the first-enabled channel.

2) Sequence to the next-enabled channel until all

enabled channels have been converted.

3) Wait the sample wait time.

4) Repeat the procedure.

Use the sample wait feature to reduce supply current

when measuring slow-changing analog signals. This

power savings occurs when reference mode 00 or 01 is

used in combination with wait times longer than 80µs.

With reference mode 10 or wait times of less than 80µs,

the internal reference system remains powered up, mini-

mizing any power savings. See the

Computing Data

Throughput section. Table 8 shows the B7, B6, B5 wait

time encoding.

Setup Register: Interrupt Control (B4, B3)

Bits B3 and B4 in the setup register configure INT and

how it responds to an alarm event (see the

Alarm

options.

Table 7. Setup Register Format

B7 (MSB)

B0 (LSB)

Sample wait bits

Interrupt

active

Interrupt

polarity

Scan

mode

Reference

source B1

Reference

source B2

Table 8. Wait Time Encoding

B7, B6, B5

WAIT TIME (ms)

000

001

0.080

010

0.395

011

1.310

100

4.970

101

19.600

110

78.200

111

312.000

Table 9. Interrupt Control

BIT FUNCTION

BIT

STATE

INT OPERATION

Driven high or low at all times

Output

driver type

High-Z when inactive, driven (high

or low) when active

1Active high, inactive = low or high -Z

Output

polarity

0Active low, inactive = high or high -Z

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