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Micrel
Pin Configuration
315MHz/315.802, 900Hz Baud Rate Example
MICRF218
RO1
GNDRF
ANT
GNDRF
Vdd
IF_BW
SEL0
SHDN
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
RO2
NC
RSSI
CAGC
CTH
SEL1
DO
GND
MICRF218AYQS
Pin Description
16-Pin
QSOP
1
2
3
4
5
6
7
8
9
16-Pin
QSOP
10
11
12
13
14
15
16
Pin
Name
RO1
GNDRF
ANT
GNDRF
VDD
IF_BW
SEL0
SHDN
GND
Pin
Name
DO
SEL1
CTH
CAGC
RSSI
NC
RO2
Pin Function
Reference resonator input connection to Colpitts oscillator stage. May also be driven by external
reference signal of 1.5V p-p amplitude maximum.
Negative supply connection associated with ANT RF input.
RF signal input from antenna. Internally AC-Coupled. It is recommended that a matching network
with an inductor to RF ground is used to improve ESD protection.
Negative supply connection associated with ANT RF input.
Positive supply connection for all chip functions.
IF bandwidth control logic input. Use VDD for Wide IF Bandwidth or VSS for Narrow IF Bandwidth.
This pin must not be left floating, must be tied to VDD or VSS.
Logic control input with active internal pull-up. Used in conjunction with SEL1 to control the
demodulator low pass filter bandwidth. (See filter table for SEL0 and SEL1 in application
subsection)
Shutdown logic control input. Active internal pull-up and must be pulled low for Normal Operation.
Negative supply connection for all chip functions except RF input.
Pin Function
Demodulated data output.
Logic control input with active internal pull-up. Used in conjunction with SEL0 to control the
demodulator low pass filter bandwidth. (See filter table for SEL0 and SEL1 in application
subsection)
Demodulation threshold voltage integration capacitor. Capacitor to GND sets the settling time for
the demodulation data slicing level. Values above 1nF are recommended and should be optimized
for data rate and data profile.
AGC filter capacitor. A capacitor, normally greater than 0.47uF, is connected from this pin to GND
Received signal strength indication output. Output is from a buffer with 200 ohms typical output
impedance.
Not Connected
Reference resonator connection. 7pF in parallel with low resistance MOS switch to GND during
normal operation. Driven by startup excitation circuit during the internal startup control sequence.
November 2011
2
M9999-111111
(408) 944-0800
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