RFPIC12F675H-I/SS Microchip Technology, RFPIC12F675H-I/SS Datasheet - Page 56

• Manufacturer Part Number: RFPIC12F675H-I/SS
• Description: IC MCU 1KX14 RF FSK/ASK 20SSOP
• Manufacturer: Microchip Technology
• Series: PIC®r

Specifications of RFPIC12F675H-I/SS

• Frequency: 850MHz ~ 950MHz
• Applications: RKE, Security Systems
• Modulation Or Protocol: ASK, FSK
• Data Rate - Maximum: 40 kbps
• Power - Output: 10dBm
• Current - Transmitting: 14mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Memory Size: 1024 x 14 words Flash, 128 x 8 Byte EEPROM, 64 x 8 Byte SRAM
• Voltage - Supply: 2V ~ 5.5V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 20-SSOP
• Processor Series: RFPIC12F
• Core: PIC
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 1.75 KB
• Data Ram Size: 64 B
• Interface Type: USB
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 6
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: ICE2000
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 4 bit
• For Use With: XLT20SS-1 - SOCKET TRANSITION 18DIP 20SSOPAC124002 - MOD SKT PROMATEII 18SOIC/20SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Details

rfPIC12F675
9.9
The mode control logic pin RFEN controls the
the crystal oscillator starts up. The voltage on the LF
pin ramps up proportionally to the RF frequency. The
PLL can lock onto the frequency faster than the start-
ing up crystal can stabilize. When the LF pin reaches
0.8V, the RF frequency is close to locked on the crys-
tal frequency. This initiates a 150 microsecond delay
to ensure that the PLL settles. After the delay, the PS
bias current and power amplifier are enabled to start
transmitting when DATA
When RFEN is low, the transmitter goes into a very
low power Standby mode. The power amplifier is
pin has an internal pull-down resistor.
9.10
The rfPIC12F675 transmitter has a built in low voltage
disable centered at about 1.85V. If the supply voltage
drops below this voltage the power amplifier is
DS70091A-page 54
operation of the transmitter. When RFEN goes high,
disabled and the crystal oscillator stops. The RFEN
disabled to prevent uncontrolled transmissions.
Digital Control Signals
Low Voltage Output Disable
ASK
goes high.
Preliminary
 2003 Microchip Technology Inc.