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Version 0.5 – January 2017

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5.3.5

Entering and Exiting Sleep Mode

In sleep mode the sensor uses the minimum amount of current. The mode can only be entered from idle mode, i.e. when the

sensor is not measuring.

This mode is particularly useful for battery operated devices. To minimize the current in this mode, the complexity of the sleep

mode circuit has been reduced as much as possible, which is mainly reflected by the way the sensor exits the sleep mode.

In sleep mode the sensor cannot be soft reset.

Command

Command code

(Hex)

Consecutive

read

Description

Enter Sleep mode

0x3677

NA

Triggered mode: the sleep command can be sent after the

result have been read out and the sensor is in idle mode.

Continuous mode: the sleep command can be sent after a

stop continuous measurement command has been issued

and is in idle mode.

Exit Sleep mode

NA

NA

The sensor exits the sleep mode and enters the idle mode

necessary to poll the sensor to see whether the sensor has

received the address and has woken up. This should take

maximum 2ms.

5.3.6

Read Product Identifier

During assembly and start-up of the machine it might be required to check some basic parameters in the sensor - for example

to check if the correct sensor is integrated.

The product identifier and serial number can be read out after sending a sequence of two commands.

Command

Command code

Consecutive read

Description

Read product

identifier

0x367C

0xE102

Byte1: Product number [31:24]

Byte2: Product number [23:16]

Byte3: CRC

Byte4: Product number [15:8]

Byte5: Product number [7:0]

Byte6: CRC

Byte7: Serial number [63:56]

Byte8: Serial number [55:48]

Byte9: CRC

Byte10: Serial number [47:40]

Byte11: Serial number [39:32]

Byte12: CRC

Byte13: Serial number [31:24]

Byte14: Serial number [23:16]

Byte15: CRC

Byte16: Serial number [15:8]

Byte17: Serial number [7:0]

Byte18: CRC

Note that both commands need to be preceded

with an I2C write header (I2C address + W).

The second command returns:

-

32 bit unique product and revision

number. The number is listed in the

table below.

Note that the last 8 bits are the revision

number and are subject to change as

long as the datasheet is preliminary.

-

64 bit unique serial number

Product

Product number

SDP800-500Pa

0x03020186

SDP810-500Pa

0x03020A86

SDP800-125Pa

0x03020286

SDP810-125Pa

0x03020B86