SDP800 Datasheet, PDF (9/14 Pages) List of Unclassifed Manufacturers – Excellent repeatability, no drift, no offset

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
Enter Sleep mode
Exit Sleep mode
Command code
(Hex)
0x3677
NA
Consecutive
read
NA
NA
Description
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.
The sensor exits the sleep mode and enters the idle mode
when it receives the valid I²C address and a write bit (‘0’).
Note that the I²C address is not acknowledged. It is
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
Read product 0x367C
identifier
0xE102
Consecutive read
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
Description
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
SDP800-500Pa
SDP810-500Pa
SDP800-125Pa
SDP810-125Pa
Product number
0x03020186
0x03020A86
0x03020286
0x03020B86
www.sensirion.com
Version 0.5 – January 2017
9/14