SIM3U1XX-B-DK Silicon_Laboratories, SIM3U1XX-B-DK Datasheet - Page 8

• Manufacturer Part Number: SIM3U1XX-B-DK
• Description: Specifications: Lead Free Status: Lead Free ; RoHS Status: RoHS Compliant
• Manufacturer: Silicon_Laboratories

UDP SiM3U1xx
4.2. Analog Terminals (H1)
Several of the SiM3U1xx port pins used for analog functions are connected to the H1 terminal block. Refer to
Table 1 for the H1 terminal block connections.
4.3. User Control Switch (SW4)
The User Control Switch enables and disables the User Control portion of the board. When in the ON position,
various GPIO pins are connected to the push-button switches, LEDs, and potentiometer. When in the OFF
position, the GPIO pins are disconnected from the hardware in the User Control portion of the board. The OFF
selection should be used if another I/O board is connected to the MCU Card via a UDP motherboard or if the GPIO
pins are needed for different functions. Table 2 shows a list of the GPIO pins that are controlled by the User Control
Switch.
4.4. Potentiometer (R15)
The potentiometer is available on PB1.5. To use the potentiometer, install a shorting block on J16 to connect PB1.5
to POT. To facilitate a low-power potentiometer, PB2.12 connects to bottom of the potentiometer as a
potentiometer enable. Drive PB2.12 low to enable the potentiometer. The User Control switch must be in the ON
position to use the potentiometer.
4.5. System Power Select Switch (SW5)
The MCU card has two power supply options: USB power or UDP motherboard power. The System Power Select
Switch is used to select between the two. If the MCU card is used without the UDP Motherboard, this switch should
be placed in the USB position. While in the USB position, the part can be powered by USB through the mini-B USB
connector (J13) labeled “Device USB”. To power the MCU with a DC power supply, the power supply can be
attached to the VDD header (J50) or the VREGIN header (J53) to the left of the System Power Select Switch. In
either of these configurations, the System Power Select should be in the USB position.
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Table 1. Terminal Block Pin Descriptions (H1)
GPIO Pin
Table 2. User Controlled GPIO Pins
PB2.10
PB2.12
PB2.11
PB1.5
PB2.8
PB2.9
Pin
1
2
3
4
5
6
Push-Button Switch (SW2)
Push-Button Switch (SW3)
User Control Function
Rev. 0.2
PB0.11 / VREFGND
Potentiometer Bias
Yellow LED (DS4)
PB1.5 / ADCn.14
PB1.6 / ADCn.15
PB0.13 / IDAC0
Red LED (DS3)
PB0.12 / VREF
Potentiometer
GND
I/O