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Silicon Labs

USB Microcontrollers » SiM3U157

Order Number Distributor Stock    
SIM3U157-B-GM Avnet Electronics Marketing 0 ORDER QUOTE
SIM3U157-B-GMR Avnet Electronics Marketing 0 ORDER QUOTE
SIM3U157-B-GQ Mouser Electronics 154 BUY NOW QUOTE
Avnet Electronics Marketing 0 ORDER QUOTE
SIM3U157-B-GQR Avnet Electronics Marketing 0 ORDER QUOTE

The Precision32™ family offers a full lineup of footprint compatible ARM® Cortex™-M3 based MCU devices ranging in Flash size from 32–256 kB with industry-leading benefits in terms of low power, analog capabilities, configurability, rapid development and integration. The SiM3U1xx family includes USB 2.0 to easily add USB to your embedded designs.

Initializing peripherals and the patented dual-crossbar is a breeze with the Precision32 AppBuilder, a free GUI that enables developers to quickly and graphically initialize peripherals, properties, and pinouts — all without reading the data sheet. Combining the world’s best peripherals with the de facto standard 32-bit core makes designing with an MCU easier than ever.


  • 32-bit ARM Cortex-M3 CPU
  • 80 MHz maximum system clock
  • 32–256 kB Flash and 8–32 kB SRAM
  • External bus interface supports up to 16 MB external memory and parallel LCD interface
  • Ultra low power modes
    • 85 nA sleep mode w/ brown out detector and 4 kB RAM preserved
    • 350 nA sleep mode w/ RTC (internal oscillator)
    • 650 nA sleep mode w/ RTC (external oscillator)
    • 275 μA/MHz at 80 MHz
  • USB 2.0-compliant full speed with 2 kB buffer
  • 48 MHz internal oscillator for crystal-less USB operation
  • Internal oscillator with PLL: 1–80 MHz ±1.5% accuracy; spread-spectrum mode for reduced EMI
  • 2 x 12-bit 250 ksps ADCs (1 MSPS in 10-bit mode)
  • 1.2/1.65/2.4 V internal voltage references
  • 2 x 10-bit digital-to-analog converters
  • Temperature sensor
  • 2 low-power comparators with 6-bit programmable voltage reference
  • 16 capacitive touch inputs
  • 16-channel DMA
  • 2 x USART, 2 x UART, 3 x SPI, 2 x I2C, I2S
  • 2 x 32-bit or 4 x 16-bit timers with capture/compare
  • 2 x 16-bit, 2-ch. counters with capture/compare/PWM
  • 16-bit, 6-channel motor control counter
  • Up to 6 high drive (5–300mA) I/O
  • Up to 65 flexible I/O
  • 128/192/256-bit hardware AES encryption
  • 16/32-bit CRC
  • JTAG, serial-wire, and ETM debugger support
  • Temperature range: –40 to +85 °C
  • 2.7–5.5 V supply voltage (internal regulator enabled)
  • 1.8–3.6 V supply voltage (internal regulator disabled)
  • LGA, QFN and TQFP package options (40/64/80/92-pin)


  • Portable medical
  • Barcode scanner
  • POS peripherals
  • Wireless trackers
  • USB audio
  • White goods
  • Motor control
  • Home automation/security
  • Sensor controllers
  • Optical touch screen
  • Instrumentation
  • USB audio
  • 10G+ optical transceivers
  • Power Tools
  • Vending Machines
  • Factory Automation
  • Server Backplanes
  • Server Fans
  • Industrial monitoring
  • Model cars/planes
  • HVAC
  • Lighting
  • E-book Readers

Data Sheet


Reference Manual


Development Kits etc.

Provider Tool name Order Number
Silicon Labs Precision32™ SiM3U1xx (USB) Development Kit SiM3U1xx-B-DK
Silicon Labs Precision32™ SiM3U1xx (USB) Enhanced Development Kit SiM3U1xx-B-EDK
Silicon Labs C8051T622DK Development Kit C8051T622DK
Silicon Labs C8051F380DK Development Kit C8051F380DK

IDEs (Compilers etc.)

Provider Tool name Order Number
Keil RealView® MDK for ARM MDK-ARM
Keil RealView® MDK for ARM Basic MDK-ARM-B
IAR Systems Embedded Workbench for ARM EWARM
Keil ARM Development Studio 5 (DS-5) Application Edition Node... DS5AE-KT-30000
Keil ARM Development Studio 5 (DS-5) Application Edition... DS5AE-KT-40000
Keil ARM Development Studio 5 (DS-5) Linux Edition Node Locked... DS5LE-KT-30000
IAR Systems Embedded Workbench for ARM - Baseline EWARM-BL
Keil RealView Development Suite 4.1 Windows Node Locked License RS410-KT-30000
Keil RealView 4.1 Professional Development Suite Windows... RS41P-KT-40000
CodeSourcery Sourcery G++ for ARM EABI SGPP_ARM_EABI_s10
CodeSourcery Sourcery G++ for ARM uClinux SGPP_ARM_uC_s10
CodeSourcery Sourcery G++ for ARM GNU/Linux SGPP_ARM_LNX_s10
Keil RealView 4.1 Professional Development Suite Windows Node... RS41P-KT-30000

Debuggers / Simulators

Provider Tool name Order Number
Macraigor Systems JTAG Commander JTAG Commander
Micrium uC/Probe PRB-WINX-000000-P-P1-A

JTAG Probes

Provider Tool name Order Number
Tag-Connect Black Sphere Debugger Black-Sphere-Dbg
Macraigor Systems usb2Demon™ 14 pin ARM JTAG header U2D-ARM-14
Macraigor Systems usb2Demon™ 20 pin ARM JTAG header U2D-ARM-20
IAR Systems J-Trace for ARM Cortex-M3 jlink-ARM Cortex-M3
Macraigor Systems mpDemon™ 14 pin ARM JTAG header MARM14
Macraigor Systems mpDemon™ 20 pin ARM JTAG header MARM20
Macraigor Systems usb2Wiggler™ 14 pin ARM JTAG header U2W-ARM-14
Macraigor Systems usb2Wiggler™ 20 pin ARM JTAG header U2W-ARM-20
Macraigor Systems Raven 14 pin ARM JTAG header RARM-14
Macraigor Systems Raven 20 pin ARM JTAG header RARM-20
Macraigor Systems Wiggler with 14 pin ARM JTAG header WNPJ-ARM-14
Macraigor Systems Wiggler with 20 pin ARM JTAG header WNPJ-ARM-20
Macraigor Systems usb2Sprite™ for 20 pin ARM JTAG header U2S-ARM-20
SEGGER Microcontroller J-Trace for Cortex-M3 JTAG emulator 8.13.00 J-TRACE FOR CORTEX-M3
NXP Semiconductors J-Link JTAG OM11031
SEGGER Microcontroller J-Link ULTRA 8.16.00 J-LINK ULTRA
SEGGER Microcontroller J-Link 8.08.00 J-LINK
SEGGER Microcontroller J-Link 5V Adapter 8.08.15
SEGGER Microcontroller J-Link PRO 8.12.00 J-LINK PRO
Abatron AG High-speed BDM/JTAG Interface for GNU Debugger BDI3000/A & bdiGDB Firmware
Keil ULINKpro Debug and Trace Unit ULINKpro
SEGGER Microcontroller J-Link EDU 8.08.90 J-LINK EDU

Operating Systems

Provider Tool name Order Number
Micrium µC/OS-III KRN-K3XX-PKG000-P-P1-A
CMX Systems CMX-Tiny+ RTOS CMX-Tiny
CMX Systems CMX-RTX, preemptive, multi-tasking RTOS CMX-RTX
SEGGER Microcontroller embOS (Real Time Operating System) 1.xx.xx
Micro Digital Inc. smx® Real Time Kernel for ARM and Cortex smxARM
Micro Digital Inc. SMX.Blaze™ blaze

Stacks/Protocols/File systems

Provider Tool name Order Number
CMX Systems CMX TCP/IP is a full-featured and fast TCP/IP stack CMX-TCP/IP
CMX Systems CMX-MicroNet is a very small and fast TCP/IP stack CMX-MicroNet
CMX Systems CMX-FFS is a Flash File System FFS
Micro Digital Inc. smxWiFi™ WiFi Stack smxWiFi
Micro Digital Inc. smxUSBD™ USB Device Stack smxUSBD
Micro Digital Inc. smxUSBO™ USB OTG Stack smxUSBO
Micro Digital Inc. smxUSBH™ USB Host Stack smxUSBH
Micro Digital Inc. smxFFS™ Flash File System smxFFS
Micro Digital Inc. smxFS™ Portable File System smxFS
Interniche Technologies FAT File System FatFile
Interniche Technologies NicheStack HTTP Server NicheStack HTTP
Interniche Technologies NicheStack SNMP NicheStack SNMP
Interniche Technologies NicheStack SSL/TLS NicheStack SSL
Interniche Technologies NicheStack IPSec IPSec
Interniche Technologies NicheStack RTP/RTCP NicheStack RTP
Interniche Technologies Gateway protocols Various
Interniche Technologies NicheStack IPv4 IPv4
Micro Digital Inc. smxNS™ TCP/IP Stack smxNS
SEGGER Microcontroller emWin (Graphics Software and GUI) 3.xx.xx
SEGGER Microcontroller emUSB (Embedded USB Stack) 9.xx.xx
SEGGER Microcontroller emFile (Embedded File System) 2.xx.xx
SEGGER Microcontroller embOS/IP (TCP/IP Stack) 7.xx.xx
HCC Embedded Fail-safe File Systems FFS
HCC Embedded MISRA Compliant TCP/IPv4 & IPv6 TCPIP
HCC Embedded Smart-meter File System SMFS
HCC Embedded Verifiable SSL/TLS SSLTLS
HCC Embedded eTaskSync Verifiable Scheduler ETASKSYNC
HCC Embedded Fail-safe Flash Translation Layer FTL
HCC Embedded USB Device, Host and OTG EUSB
HCC Embedded Fail-safe Bootloader BL
Interniche Technologies NicheStack Dual IPv4/IPv6 IPv4/IPv6
Interniche Technologies NicheStack IPv6 IPv6


Provider Tool name Order Number
SEGGER Microcontroller Flasher ARM 5.07.01 FLASHER ARM

Software Design

Provider Tool name Order Number
IAR Systems IAR visualSTATE VS

Other Software Tools

Provider Tool name Order Number
SEGGER Microcontroller J-Flash 8.08.02
SEGGER Microcontroller J-Link RDI 8.08.03
SEGGER Microcontroller J-Link Flash Breakpoint 8.08.04
SEGGER Microcontroller J-Link GDB Server 8.08.08
SEGGER Microcontroller J-Link Flash Download 8.08.05
Macraigor Systems Java Board Test Java Board Test
Micro Digital Inc. GoFast® Floating Point Library GoFast
Micro Digital Inc. Prism GUI Products smxPrism
Micro Digital Inc. PEG GUI Products smxPEG

General Accessories

Provider Tool name Order Number
SEGGER Microcontroller J-Link ARM-14 8.08.01 J-LINK ARM-14
SEGGER Microcontroller JTAG Isolator 8.07.00 JTAG ISOLATOR
SEGGER Microcontroller J-Link 19-Pin Cortex-M Adapter 8.06.02 J-LINK 19-PIN CORTEX-M ADAPTER
SEGGER Microcontroller J-Link 9-Pin Cortex-M Adapter 8.06.00 J-LINK 9-PIN CORTEX-M ADAPTER