LTC2984 datasheet(64/78 Pages) AD

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LTC2984

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RUNNING CONVERSIONS CONSECUTIVELY ON

MULTIPLE CHANNELS

Generally, during the Initiate Conversion state, a conver-

sion measurement is started on a single input chan-

nel determined by the channel number (bits B[4:0] =

00001 to 10100) written into memory location 0x000.

Multipleconsecutiveconversionscanbeinitiatedbywriting

bits B[4:0]=00000 into memory location 0. Conversions

will be initiated on each channel selected in the mask

For example, using the mask data shown in Table 70, after

1000000 is written into memory location 0, conversions

areinitiatedconsecutivelyonCH20,CH19,CH16,andCH1.

Oncetheconversionsbegin,theINTERRUPTpingoesLOW

and remains LOW until all conversions are complete. If

the mask register is set for a channel that has no assign-

ment data, that conversion step is skipped. All the results

are stored in the conversion result memory locations and

can be read at the conclusion of the measurement cycle.

Table 69. Multiple Conversion Mask Register

MEMORY LOCATION

0x0F4

Reserved

0x0F5

CH20

CH19

CH18

CH17

0x0F6

CH16

CH15

CH14

CH13

CH12

CH11

CH10

CH9

0x0F7

CH8

CH7

CH6

CH5

CH4

CH3

CH2

CH1

Table 20. Example Mask Register Select CH20, CH19, CH16, and CH1

MEMORY LOCATION

0x0F4

Reserved

0x0F5

0x0F6

0x0F7

SUPPLEMENTAL INFORMATION

ENTERING/EXITING SLEEP MODE

The LTC2984 can be placed into sleep mode by writing

0x97 to memory location 0x000. On the rising edge of

CS following the memory write (see Figure 2) the device

enters the low power sleep state. It remains in this state

until CS is brought low or RESET is asserted. Once one

of these two signals is asserted, the LTC2984 begins its

start-up cycle as described in State 1: Start-Up section

of this data sheet.

MUX CONFIGURATION DELAY

The LTC2984 performs 2 or 3 internal conversion cycles

pertemperatureresult.Eachconversioncycleisperformed

with different excitation and input multiplexer configura-

tions. Prior to each conversion, these excitation circuits

and input switch configurations are changed and an

internal 1ms (typical) delay ensures settling prior to the

conversion cycle in most cases.

LTC2984 Datasheet(PDF) 64 Page - Analog Devices

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