C8051F337-GM Silicon Laboratories Inc, C8051F337-GM Datasheet - Page 121

• Manufacturer Part Number: C8051F337-GM
• Description: IC MCU 16K FLASH 20QFN
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F33xr

Specifications of C8051F337-GM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 17
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-QFN
• Processor Series: C8051F3x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 768 B
• Interface Type: I2C, SPI, UART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 17
• Number Of Timers: 4
• Operating Supply Voltage: 2.7 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: KSK-SL-TOOLSTICK, PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F336DK
• Minimum Operating Temperature: - 40 C
• For Use With: 336-1451 - ADAPTER PROGRAM TOOLSTICK F330
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details
• Other names: 336-1428-5

20.1.3. Interfacing Port I/O to 5V Logic
All Port I/O configured for digital, open-drain operation are capable of interfacing to digital logic operating at
a supply voltage higher than VDD and less than 5.25V. An external pull-up resistor to the higher supply
voltage is typically required for most systems.
Important Note: In a multi-voltage interface, the external pull-up resistor should be sized to allow a current
of at least 150uA to flow into the Port pin when the supply voltage is between (VDD + 0.6V) and
(VDD + 1.0V). Once the Port pin voltage increases beyond this range, the current flowing into the Port pin
is minimal. Figure 20.3 shows the input current characteristics of port pins driven above VDD. The port pin
requires 150 µA peak overdrive current when its voltage reaches approximately (VDD + 0.7 V).
WEAKPUD
(Weak Pull-Up Disable)
Px.x – Output
Logic Value
(Port Latch or
Crossbar)
PxMDOUT.x
(1 for push-pull)
(0 for open-drain)
XBARE
(Crossbar
Enable)
Px.x – Input Logic Value
(Reads 0 when pin is configured as an analog I/O)
To/From Analog
Peripheral
Port I/O Overdrive Test Circuit
V
Cell
I/O
DD
PxMDIN.x
(1 for digital)
(0 for analog)
Figure 20.2. Port I/O Cell Block Diagram
Figure 20.3. Port I/O Overdrive Current
I
Vtest
+
-
V
test
Rev.1.0
I
(µA)
Vtest
Port I/O Overdrive Current vs. Voltage
-150
-10
0
VDD
GND
V
C8051F336/7/8/9
DD
V
test
V
DD
(V)
+0.7
VDD
(WEAK)
PORT
PAD
121