I/o devices, Push button switches, Leds – Echelon FT 5000 EVB User Manual
Page 15: Temperature sensor, Light-level sensor
FT 5000 EVB Hardware Guide
7
I/O Devices
This section briefly describes the I/O devices included on the FT 5000 EVB, which consists of two
push buttons, two LEDs, a temperature sensor, a light sensor, an LCD, and a joystick.
Push Button Switches
The FT 5000 EVB includes two push-button switches. The switches are labeled SW1 and SW2. The
SW1 push button is connected to the IO9 pin on the FT 5000 Smart Transceiver. The SW2 push
button is connected to a 74HC165 8-bit parallel-in/serial-out shift register, and data is shifted on the FT
5000 Smart Transceiver IO4 (clock) and IO5 (data) pins, with a latch strobe on IO6 (active low to
capture). The button readings must be debounced under application control.
LEDs
The FT 5000 EVB includes two blue LEDs that are labeled LED1 and LED2. LED1 is connected to
the FT 5000 Smart Transceiver IO2 pin when jumper pins 9-10 on JP31 are connected. LED2 is
connected to the IO3 pin when jumper pins 11-12 on JP31 are connected.
Temperature Sensor
The FT 5000 EVB includes a temperature sensor based on a 1-Wire
®
Maxim Integrated Products
digital thermometer (Part No. DS18S20). The thermometer uses the Touch I/O interface and is
connected to the FT 5000 Smart Transceiver IO7 pin. For more information about this temperature
sensor, see its data book at
Light-Level Sensor
The FT 5000 EVB includes a light-level sensor based on a Texas Advanced Optoelectronic Solutions
®
Light-To-Digital Converter (Part No. TSL2561). The light sensor is connected to the FT 5000 Smart
Transceiver IO0 and IO1 pins (via the I
2
C interface). The I
2
C address for the light level sensor is
0x39. For more information about this light sensor, see its data book at
.