MICRF405 290MHz 980MHz ISM Band ASK / FSK Transmitter General Description The MICRF405 is a 290MHz-980MHz RF transmitter RadioWire IC designed for unlicensed ISM band operations. It s Features designed to work in the North American 315MHz and 915MHz bands as well as the European FSK/ASK transmitter 433MHz and 868MHz bands. The device is fully Frequency programmable FCC Part 15.247 and EN300-220-compliant. ASK modulation depth programmable The transmitter consists of a FSK/ASK modulator, PLL frequency synthesizer and a power amplifier. High efficiency power amplifier The frequency synthesizer consists of a voltage- Programmable output power controlled oscillator (VCO), a crystal oscillator, dual Power down function modulus prescaler, programmable frequency MCU reference clock dividers and a phase-detector. The loop-filter can be Base band package engine internal or external. The output power of the power amplifier can be programmed to eight levels. A lock TX buffer detect circuit detects when the PLL is in lock. No external tuning circuitry In FSK mode, the user can select between three different modulation types allowing a data rate up to Applications 200kbps. When selecting FSK modulation applied with dividers, the MICRF405 is switching between to Meter reading sets of register values (M0,N0,A00 and M1,N1 Automotive and A11 ). The second modulation type is closed Smart Home loop VCO modulation using the internal modulator Remote control systems that applies the modulated data to the VCO. The third FSK modulation type is Open loop VCO Residential Automation modulation. Wireless security system In ASK modulation, the user can select between two modulation types, with or without spreading. In both modes the modulation depth is programmable. MicroLead Frame and MLF are registered trademarks of Amkor Technologies RadioWire is a registered trademark of Micrel, Inc. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel MICRF405 Table of Contents General Description ................................................................................................................................................................... 1 Features..................................................................................................................................................................................... 1 Applications................................................................................................................................................................................ 1 Table of Contents....................................................................................................................................................................... 2 Ordering Information .................................................................................................................................................................. 3 Block Diagram............................................................................................................................................................................ 3 Pin Configuration........................................................................................................................................................................ 4 (1) Absolute Maximum Ratings ..................................................................................................................................................... 5 (2) Operating Ratings ................................................................................................................................................................... 5 Electrical Characteristics............................................................................................................................................................ 5 Electrical Characteristics (cont.)................................................................................................................................................. 6 Data and Configuration Interface ............................................................................................................................................... 7 Programming Interface Timing .............................................................................................................................................. 8 Writing to the Control Registers in MICRF405....................................................................................................................... 9 What to write: ........................................................................................................................................................................ 9 How to write:.......................................................................................................................................................................... 9 The two different ways to program the chip are: ................................................................................................................. 9 Writing to a Single Register................................................................................................................................................... 9 How to write:.......................................................................................................................................................................... 9 Writing to All Registers ........................................................................................................................................................ 10 What to write ....................................................................................................................................................................... 10 How to write:........................................................................................................................................................................ 10 Writing to n Registers Having Incremental Addresses......................................................................................................... 10 What to write ....................................................................................................................................................................... 11 Writing to n Registers Having Non-Incremental Addresses................................................................................................. 12 Reading from the Control Registers in MICRF405 .............................................................................................................. 12 Reading from the Interrupt Register .................................................................................................................................... 12 Data Interface and Data Transfer............................................................................................................................................. 13 Packet Engine Overview: .................................................................................................................................................... 14 How to transmit a Packet with the Packet Engine: .............................................................................................................. 15 Programming Summary....................................................................................................................................................... 17 Main Modes of Operation......................................................................................................................................................... 18 Power Amplifier........................................................................................................................................................................ 18 Frequency Synthesizer............................................................................................................................................................. 19 Crystal Oscillator (XCO)........................................................................................................................................................... 21 VCO ......................................................................................................................................................................................... 22 Charge Pump and PLL Filter.................................................................................................................................................... 24 Modulation................................................................................................................................................................................ 27 Bit rate settings.................................................................................................................................................................... 30 Modulator ............................................................................................................................................................................ 30 Deviation setting.................................................................................................................................................................. 31 Shaping ............................................................................................................................................................................... 31 Modulator saturation............................................................................................................................................................ 31 Lock Detect ......................................................................................................................................................................... 32 Low Dropout Regulator (LDO) and Low Battery Detector.................................................................................................... 33 Bit Description.......................................................................................................................................................................... 34 Typical Application Circuit ........................................................................................................................................................ 42 Package Information ................................................................................................................................................................ 45 2 M9999-041906 April 2006 (408) 955-1690