User Manual EE895
Miniature Sensor Module for CO
2
, Temperature and Barometric Pressure | 12
3.7 Typical Applications
3.7.1. EE895 Connected to USB Interface
Fig. 9
Example USB Interface
Pin 7 - ISEL is not connected → the EE895 features UART interface.
VCC_EM is connected to the nominal 5 V from USB, the VCC_IO and EN are connected to 3.3 V voltage
regulator.
The host can read the values at any time, pin 6 - RDY is not used.
3.7.2. EE895 in Battery Powered Devices
Fig. 10 Example battery powerd devices
Pin 7 - ISEL is connected to the ground → the EE895 features I
2
C interface.
VCC_EM is supplied by a low ESR super-capacitor and VCC_IO is connected to a typical low drop
3.3 V regulator.
The I
2
C host enables the EE895 with pin 3 - EN.
By checking the status of pin 6 - RDY (pulled up), the host can read the data as soon as available. After reading
the data, EE895 can be disabled with pin 3.
