SIM3U146-B-GM Silicon Labs, SIM3U146-B-GM Datasheet - Page 6

• Manufacturer Part Number: SIM3U146-B-GM
• Description: ARM Microcontrollers - MCU ARM Cortex-M3 USB 64KB QFN64
• Manufacturer: Silicon Labs

Specifications of SIM3U146-B-GM

• Rohs: yes
• Core: ARM Cortex M3
• Processor Series: SIM3U1xx
• Data Bus Width: 32 bit
• Maximum Clock Frequency: 80 MHz
• Program Memory Size: 64 KB
• Data Ram Size: 32 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 1.8 V to 3.6 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: QFN-64
• Mounting Style: SMD/SMT
• Interface Type: 2 x I2C, I2S, 3 x SPI, 2 x USART, 2 x UART
• Number Of Programmable I/os: 65
• Number Of Timers: 2 x 32 bit
• Supply Voltage - Max: 3.6 V

SiM3U1xx
Figure 2.3. Connection Diagram with Voltage Regulator Used and USB Connected (Bus-Powered)
Figure 2.4 shows a typical connection diagram for the power pins of the SiM3U1xx devices when the internal
regulator used and USB is connected (self-powered). The VBUS signal is used to detect when USB is connected
to a host device.
Figure 2.4. Connection Diagram with Voltage Regulator Used and USB Connected (Self-Powered)
Figure 2.5 shows a typical connection diagram for the power pins of the SiM3U1xx devices when the internal
regulator used, USB is connected (bus-powered), and the VIO and VIOHD pins are sourced from separate
supplies.
6
1 uF and 0.1 uF bypass
each power pin placed
capacitors required for
as close to the pins as
1 uF and 0.1 uF bypass
each power pin placed
capacitors required for
as close to the pins as
possible.
possible.
USB 5 V
(sense)
USB 5 V (in)
3.6-5.5 V (in)
3.3 V (out)
Rev. 1.0
3.3 V (out)
VREGIN
VSSHD
VIOHD
VBUS
VDD
VSS
VIO
VREGIN
VSSHD
VIOHD
VBUS
VDD
VSS
VIO
SiM3U1xx Device
SiM3U1xx Device
VREGn
VREGn