MICRF230 400MHz to 450MHz ASK/OOK Receiver with RSSI and Squelch General Description Features The MICRF230 is a 400MHz to 450MHz super- 112dBm sensitivity at 1kbps with 1% BER heterodyne, image-reject, RF receiver with automatic gain Supports bit rates up to 20kbps at 433.92MHz control, ASK/OOK demodulator, analog RSSI output, and 25dB image-reject mixer integrated squelch features. It only requires a crystal and a No IF filter required minimum number of external components to implement. The MICRF230 is ideal for low-cost, low-power, RKE, 60dB analog RSSI output range TPMS, and remote actuation applications. 3.5V to 5.5V supply voltage range 6.0mA supply current at 434MHz The MICRF230 achieves 112dBm sensitivity at a bit rate of 1kbps with 1% BER. Four demodulator filter bandwidths 0.5A supply current in shutdown mode are selectable using SEL0 and SEL1 from 1625Hz to 16-pin 4.9mm 6.0mm QSOP package 13kHz at 433.92MHz, allowing the device to support bit 40C to +105 C temperature range rates up to 20kbps. The device operates from a supply 2kV HBM ESD rating voltage of 3.5V to 5.5V and typically consumes 6.0mA at 433.92MHz. The MICRF230 has a shutdown mode that reduces current to 0.5A. The squelch feature decreases Applications the activity on the data output pin until valid bits are detected while maintaining overall receiver sensitivity. Automotive remote keyless entry (RKE) Datasheets and support documentation are available on Long range RFID Micrels web site at: www.micrel.com. Remote fan and light control Garage door and gate openers Remote metering Low data rate unidirectional wireless data links Typical Application MICRF230 Typical Application Circuit for 433.92MHz Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MICRF230 Ordering Information Junction Part Number Top Marking Package Temperature Range MICRF230YQS MICRF230YQS 40C to +105C 16-Pin 4.9mm 6.0mm QSOP Pin Configuration 16-Pin 4.9mm 6.0mm QSOP (QS) (Top View) Pin Description Pin Pin Type Pin Function Number Name Reference resonator connection (to the Pierce oscillator). Can also be driven by external 1 RO1 Input reference signal of 200mV to 1.5V amplitude maximum. Internal capacitance of 7pF to P-P P-P GND during normal operation. 2 RFGND Supply Ground connection for ANT RF input. Connect to PCB ground plane. Antenna input. RF signal input from antenna. Internally AC coupled. It is recommended to use 3 ANT Input a matching network with an inductor to RF ground to improve ESD protection. 4 RFGND Supply Ground connection for ANT RF input. Connect to PCB ground plane. Internal supply decoupling access. Bypass to PCB ground plane with a 0.1F ceramic 5 CDEC Supply capacitor located as close to pin as possible. Maximum operating voltage is 3.6V. Squelch control logic-level input. An internal pull-up (3A typical) pulls the logic-input HIGH 6 SQ Input when the device is enabled. A logic LOW on SQ squelches, or reduces, the random activity on DO pin when there is no RF input signal. Positive supply connection (for all chip functions). Bypass with 1F capacitor located as close 7 VDD Supply to the VDD pin as possible. Enable control logic-level input. A logic-level HIGH enable the device. A logic-level LOW put the device to shutdown mode. An internal pull-down (3A typical) pulls the logic input LOW. The device is designed to start up in shutdown state. The EN pin should be kept at logic low 8 EN Input (shutdown state) until after the supply voltage on VDD is stabilized. If the application is designed to have the EN pin always pulled high, it is recommended to add a shunt capacitor of 0.47F from the EN pin to ground. 9 GND Supply Ground connection for all chip functions except for RF input. Connect to PCB ground plane. Revision 2.0 April 15, 2015 2