C8051F349-GQ Silicon Laboratories Inc, C8051F349-GQ Datasheet - Page 131

• Manufacturer Part Number: C8051F349-GQ
• Description: IC 8051 MCU FLASH 32K 32LQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F34xr

Specifications of C8051F349-GQ

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 25
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• Processor Series: C8051F3x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 2.25 KB
• Interface Type: I2C, SMBus, SPI, UART, USB
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 25
• Number Of Timers: 4
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: KSK-SL-F34X, KSK-SL-TOOLSTICK, PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F340DK
• Minimum Operating Temperature: - 40 C
• For Use With: 336-1748 - ADAPTER TOOLSTICK FOR C8051F34X
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details
• Other names: 336-1509

14. Oscillators
C8051F34x devices include a programmable internal high-frequency oscillator, a programmable internal
low-frequency oscillator (C8051F340/1/2/3/4/5/8/9/A/B/C/D), an external oscillator drive circuit, and a 4x
Clock Multiplier. The internal high-frequency and low-frequency oscillators can be enabled/disabled and
adjusted using the special function registers, as shown in Figure 14.1. The system clock (SYSCLK) can be
derived from either of the internal oscillators, the external oscillator circuit, or the 4x Clock Multiplier divided
by 2. The USB clock (USBCLK) can be derived from the internal oscillator, external oscillator, or 4x Clock
Multiplier. Oscillator electrical specifications are given in Table 14.1.
VDD
Option 2
XTAL2
Option 1
Option 4
10M
XTAL2
Option 3
XTAL2
XTAL1
XTAL2
C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D
Figure 14.1. Oscillator Diagram
(C8051F340/1/2/3/4/5/8/9/
Programmable High-
OSCLF3-0
Frequency Oscillator
Programmable Low-
Frequency Oscillator
OSCICL
Circuit
Input
OSCXCN
A/B/C/D)
OSC
EN
EN
Rev. 1.3
OSCICN
EXOSC
EXOSC / 2
IOSC
EXOSC
CLKMUL
IOSC
n
OSCLCN
Clock Multiplier
x 2
n
x 2
EXOSC / 2
EXOSC / 3
EXOSC / 4
IOSC / 2
EXOSC
CLKSEL
SYSCLK
USBCLK
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