C8051F530-IMR Silicon Labs, C8051F530-IMR Datasheet - Page 140

• Manufacturer Part Number: C8051F530-IMR
• Description: 8-bit Microcontrollers - MCU 8KB 12ADC 125C
• Manufacturer: Silicon Labs

Specifications of C8051F530-IMR

• Product Category: 8-bit Microcontrollers - MCU
• Rohs: yes
• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 25 MHz
• Program Memory Size: 8 KB
• Data Ram Size: 256 B
• On-chip Adc: Yes
• Package / Case: QFN EP
• Mounting Style: SMD/SMT
• A/d Bit Size: 12 bit
• A/d Channels Available: 16
• Interface Type: SPI, UART
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 16
• Number Of Timers: 3
• On-chip Dac: No
• Processor Series: C8051
• Program Memory Type: Flash
• Factory Pack Quantity: 1500
• Supply Voltage - Max: 2.7 V, 5.25 V
• Supply Voltage - Min: 2 V, 2.7 V

C8051F52x/F53x
Note: The load capacitance depends upon the crystal and the manufacturer. Please refer to the crystal
data sheet when completing these calculations.
The equation for determining the load capacitance for two capacitors is:
Where:
C
C
The stray capacitance for a typical layout where the crystal is as close as possible to the pins is 2–5 pF per
pin.
If C
For example, a tuning-fork crystal of 32 kHz with a recommended load capacitance of 12.5 pF should use
the configuration shown in Figure 14.1, Option 1. With a stray capacitance of 3 pF per pin (6 pF total), the
13 pF capacitors yield an equivalent capacitance of 12.5 pF across the crystal, as shown in Figure 14.2.
Important Note on External Crystals: Crystal oscillator circuits are quite sensitive to PCB layout. The
crystal should be placed as close as possible to the XTAL pins on the device. The traces should be as
short as possible and shielded with ground plane from any other traces which could introduce noise or
interference.
140
A
S
and C
is the total stray capacitance of the PCB.
A
and C
B
are the capacitors connected to the crystal leads.
B
are the same (C), then the equation becomes:
Figure 14.2. 32 kHz External Crystal Example
32 kHz
13 pF
13 pF
C
L
C
=
L
Rev. 1.4
C
------------------- -
C
=
A
A

+
C
--- -
2
C
C
+
B
B
C
+
S
10 M
C
S

XTAL1
XTAL2