RFB433B Micrel Inc, RFB433B Datasheet - Page 7

• Manufacturer Part Number: RFB433B
• Manufacturer: Micrel Inc

Specifications of RFB433B

• Operating Frequency (max): 434000kHz
• Operating Temperature (min): -20C
• Operating Temperature Classification: Commercial
• Modulation Type: FSK
• Operating Supply Voltage (typ): 3V
• Lead Free Status / Rohs Status: Not Compliant

Interfacing to PIC16LF73
Interfacing to microcontrollers operating at higher
voltage levels
Standard RF blocks are designed to operate from 2.7V to
3.3V. Some Microcontrollers require higher operating
voltages for maximum clock rates.
The circuit below allows interfacing of an RF block with a
3V3 supply to a Microcontroller with a 5V supply.
Resistors form a voltage divider for the 5V logic levels
from the Microcontroller.
In RX, Q1 detects a logic low or high level via R6 and the
inverted signal is converted to 5V levels
Hovfaret 17B, N-0275 Oslo, Norway. Tel: [phone] Fax: [phone] E-mail:
22k
R5
220k
R4
22k
22k
R2
R3
220k
R2
RX-EN
47k
R1
4p7
C1
VDD
47k
R1
via R6.
RX_EN is held low during RX and 3 state in TX and
standby mode In transmit, R2 together with 2 internal
40k.
22k
R5
4p7
C1
[e-mail]
Orgnr. NO 929 510 909 www.bluechip.no
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