LTC2436-1IGN datasheet(14/28 Pages) LINER

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LTC2436-1

24361f

The serial data output pin (SDO) is Hi-Z as long as CS is

HIGH. At any time during the conversion cycle, CS may be

pulled LOW in order to monitor the state of the converter.

While CS is pulled LOW, EOC is output to the SDO pin.

EOC = 1 while a conversion is in progress and EOC = 0 if

the device is in the sleep state. With CS high, the device

automatically enters the low power sleep state once the

conversion is complete.

When the device is in the sleep state (EOC = 0), its

conversion result is held in an internal static shift regis-

ter. Data is shifted out the SDO pin on each falling edge of

SCK. This enables external circuitry to latch the output on

the rising edge of SCK. EOC can be latched on the first

rising edge of SCK and the last bit of the conversion result

can be latched on the 19th rising edge of SCK. On the 19th

falling edge of SCK, the device begins a new conversion.

SDO goes HIGH (EOC = 1) indicating a conversion is in

progress.

At the conclusion of the data cycle, CS may remain LOW

and EOC monitored as an end-of-conversion interrupt.

Alternatively, CS may be driven HIGH setting SDO to Hi-Z.

As described above, CS may be pulled LOW at any time in

order to monitor the conversion status.

Typically, CS remains LOW during the data output state.

However, the data output state may be aborted by pulling

CS HIGH anytime between the first rising edge and the

19th falling edge of SCK, see Figure 7. On the rising edge

of CS, the device aborts the data output state and imme-

diately initiates a new conversion. This is useful for abort-

ing an invalid conversion cycle or synchronizing the start

of a conversion.

Figure 7. External Serial Clock, Reduced Data Output Length

SDO

SCK

(EXTERNAL)

DATA

OUTPUT

CONVERSION

SLEEP

TEST EOC (OPTIONAL)

TEST EOC

DATA OUTPUT

Hi-Z

CONVERSION

24361 F07

MSB

SIG

CH0/CH1

BIT 4

BIT 14

BIT 5

BIT 15

BIT 16

BIT 17

EOC

BIT 18

BIT 0

EOC

Hi-Z

TEST EOC

VCC

REF+

SCK

CH1+

CH1–

SDO

GND

114

8, 9, 10, 15, 16

REFERENCE

VOLTAGE

0.1V TO VCC

CH0+

CH0–

ANALOG INPUT RANGE

–0.5VREF TO 0.5VREF

µF

2.7V TO 5.5V

LTC2436-1

3-WIRE

SPI INTERFACE

REF–

SLEEP

= EXTERNAL CLOCK SOURCE

= INTERNAL OSC/SIMULTANEOUS

50Hz/60Hz REJECTION

APPLICATIO S I FOR ATIO

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