ISL26310 datasheet(20/23 Pages) RENESAS

20 / 23 page

ISL26310, ISL26311, ISL26312, ISL26313, ISL26314, ISL26315, ISL26319

FN7549 Rev 3.00

Page 20 of 23

August 18, 2015

Device Configuration Registers

The Input Multiplexer Channel Select and power management

features are controlled by loading the appropriate bits into the

16-bit Configuration Register through the serial port, MSB-first,

as shown below. The first two Load bits LD1-LD0 must be set to

“11” in order to perform a Register update: any other setting will

leave the Register unchanged. Changes to the Configuration

the completion of the current conversion, or require a dummy

conversion in order to take effect. Also, in the case of all power

management features, a recovery time will be incurred when

returning to normal operation, as indicated.

Power Management Modes

In all SPI interface modes (RAC, RDC, etc.) the device has three

states of operation: Acquisition, Conversion and Idle. Power

management modes decide the state of the ADC in Idle mode

and are selected by the PM bits in the Configuration Register as

shown in Tables 3 and 4.

In the default mode (Continuous Operation) the ADC is fully

powered in the Idle state and can be taken back to the

Acquisition state instantaneously. In this mode the ADC can be

operated with maximum throughput and hence is ideally suitable

for applications where the ADC is operated continuously.

In Auto Sleep Mode the ISL263XX will be in a sleep state

consuming less than 0.4mA. However, it should be noted that the

requirements on tACQ are more stringent in Auto Sleep mode

since the device must wake up and then perform the Acquisition.

In Auto Power Down Mode (as selected by PM bits) the ADC will be in

power-down condition during the Idle period, consuming less than

5µA of current. Wake-up time takes 150µs. The acquisition time

(tACQ) must be increased to account for this delay.

The power management modes provide a high degree of

flexibility in trading average power consumption versus the

required throughput. Significant power savings can be achieved

by operating in either Auto Sleep Mode or Auto Power-Down

mode depending on the throughput requirements.

TABLE 3. CONFIGURATION REGISTER

BIT 15

(MSB)

LD1

LD0

ADDR2

ADDR1

ADDR0

PM1

PM0 Unused

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2 BIT 1

BIT 0

(LSB)

RGRD

Unused

TABLE 4. CONFIGURATION REGISTER 2

BIT(S)

DESCRIPTION

15:14 Register Load word, set to “11” to update registers,

otherwise previous settings are retained.

13:11 Multiplexer Channel Select word ADDR2:0.

000H: Channel AIN0 (single-ended input devices) or AIN0+/AIN0-

(differential input devices).

001H: Channel AIN1 or AIN1+/AIN1-

010H: Channel AIN2 or AIN2+/AIN2-

011H: Channel AIN3 or AIN3+/AIN3-

100H: Channel AIN4

101H: Channel AIN5

110H: Channel AIN6

111H: Channel AIN7

10:9 Power Management Configuration Control.

00H: Auto Power-Down mode. Device will go into Power-down

mode automatically at the end of the next conversion cycle.

01H: Continuous Operation mode (default). Device remains fully

powered at all times.

1xH: Auto Sleep Mode. Device will enter reduced-power Sleep

mode automatically at the end of the next conversion cycle. A "1"

in PM1 overrides the setting in PM0.

8Unused.

resulting in configuration settings to be output along with

conversion results. "0" (default) mode of operation register

settings are not output.

6:0 Unused.

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