SMD500 Datasheet, PDF (9/10 Pages) List of Unclassifed Manufacturers – Altimeter / Barometer Module ultra low power, low voltage

4.4 Read A/D conversion result or PROM data
Figure 8 shows the timing diagram to read out the temperature data word UT (16 bit), the pressure data word UP (16 bit) and
the PROM data register F1 to F4 (16 bit each).
After the start condition the master sends the module address write command and register address.
The register address selects the read register:
Temperature or pressure value UT or UP
PROM data register F1
PROM data register F2
PROM data register F3
PROM data register F4
0xF6
0xF8
0xFA
0xFC
0xFE
Then a restart condition needs to be sent by the master followed by the module address read that will be acknowledged by the
SMD500 (ACKS). It sends first the 8 MSB, acknowledged by the master (ACKM), then the 8 LSB. The master sends a not
acknowledge (NACKM) and finally a stop condition.
SCL
SDA
Module address
write 0xEE
Register address
e.g. 0xF6
Module address
read 0xEF
MSB e.g.
ADC result 0x5C
LSB e.g.
ADC result 0x96
S
ACKS
ACKS Restart
ACKS
ACKM
NACKM P
Figure 8: Timing diagram read A/D conversion result
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