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3
Interfaces and peripherals
3.1 Buttons and LEDs
Figure 4: Position of the push buttons and LEDs on the evaluation board
Annotation Function
Description
RST
Reset
Connected directly to the ANNA RESET_N pin.
button
SW2
SWITCH_2 With u-connectXpress this button can be used to reset UART settings.
☞
Table 2: USB-ANNA-B4 button
Annotation
Function
D2
Power Good Led
D3
RGB LED
Table 3: USB-ANNA-B4 LED indicators
3.2 USB to UART interface
A serial COM port is available if the USB board is connected to a PC using the USB connector J1.
3.3 I2C temperature sensor
USB-ANNA-B4 has an LM75B temperature sensor mounted on the PCB. This sensor measures the
environmental temperature and can be addressed using the I2C address 0x48.
UBX-22008565 - R01
C1-Public
See also the ANNA-B412 data sheet [1].
Description
Indicates when 3V3 voltage is applied
Connected to the ANNA RED (GPIO_31), GREEN (GPIO_32) and BLUE (GPIO_33) pins.
The RGB LED shows the status for u-connectXpress. See also the u-connectXpress
user guide
[5]
for details.
☞
See also the ANNA-B412 data sheet [1].
Interfaces and peripherals
Page 8 of 11
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