E+E Elektronik EE895 User Manual page 10

Pin 7 – ISEL (Interface selection)
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The EE895 features I C and UART interfaces.
Interface selection:
ISEL logic state
Low (0...0.9 V)
High (2.1...5.5 V) or not connected
Tab. 2 Interface selection
Serial interface pins:
Pin 8 – TX_SCL Transmission data / Serial clock
Pin 9 – RX_SDA Receiving data / Serial data
The function of pins 8 and 9 depends on the interface selected with pin 7 ISEL.
Pin 7 – ISEL connected to ground: EE895 features I
Pin no. Mode
8 SCL (serial clock)
9 SDA (serial data)
Tab. 3 Pin assignement I
Example:
2
Fig. 6 Example I C interface
Pin 7 – ISEL connected to V
Pin no. Mode
8 TX (transmission line)
9 RX (receive line)
Tab. 4 Pin assignment UART interface
EE895 interface
2
I C
UART
Comment
External pull-up resistor to V+ (bus high voltage level) is required.
External pull-up resistor to V+ (bus high voltage level) is required.
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C interface
or left open: EE895 features UART interface:
CC
Comment
CMOS compatible (V
CMOS compatible (V
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C interface:
0.4 V; V
OutLowMax
0.9 V; V
InputLowMax
Miniature Sensor Module for CO
User Manual EE895
2.6 V)
OutHighMin
2.1 V)
InputHighMin
, Temperature and Barometric Pressure | 10
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