MICRF219AAYQS(2011) Просмотр технического описания (PDF) - Micrel

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Компоненты Описание

производитель

MICRF219AAYQS
(Rev.:2011)

300MHz to 450MHz ASK/OOK Receiver with Auto-Poll, RSSI, and Squelch

Micrel 

Micrel, Inc.

Pin Configuration

MICRF219A

MICRF219AAYQS

Pin Description

Pin

Number

1

2

3

4

5

6

7

8

9

10

11

Pin

Name

RO1

GNDRF

ANT

GNDRF

VDD

SQ

SEL0

SHDN

GND

DO

SEL1

Pin Function

Reference resonator connection to the Pierce oscillator. May also be driven by external reference signal of

200mVp-p to 1.5V p-p amplitude maximum. Internal capacitance of 7pF to GND during normal operation.

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 a matching

network with an inductor to RF ground to improve ESD protection.

Ground connection for ANT RF input. Connect to PCB ground plane.

Positive supply connection for all chip functions. Bypass with 0.1μF capacitor located as close to the VDD

pin as possible.

Squelch Control Logic-Level Input. An internal pull-up (5μA typical) pulls the logic-input HIGH 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.

Tie this pin to VDD to ensure robust register programming. Use register bits D[4:3] to set demodulation

bandwidth.

Shutdown Control Logic-Level Input. A logic-level LOW enables the device. A logic-level HIGH places the

device in low-power shutdown mode. An internal pull-up (5μA typical) pulls the logic input HIGH. To ensure

that the part starts up correctly, connect a 1μF capacitor from VDD to SHDN, and a 50kΩ resistor from

SHDN pin to GND. After the supply voltage settles, apply a HIGH logic level voltage to SHDN to turn the

part off, then a LOW logic level voltage to turn the part on before programming or operating the device.

Ground connection for all chip functions except for RF input. Connect to PCB ground plane.

Data Output. Demodulated data output. A current limited CMOS output during normal operation, 25kΩ pull-

down is present when device is in shutdown.

Tie this pin to VDD to ensure robust register programming. Use register bits D[4:3] to set demodulation

bandwidth.

July 2011

2

M9999-071811-A

RadioTech@micrel.com or (408) 944-0800

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