MICRF302
Parallel Encoder
General Description
The MICRF302 is a parallel encoder which works with
QwikRadio
®
family radios to significantly shorten design
time for RF products. The part is easy to use, provides
more communication distance, and it is extremely stable
over operating temperature and operating voltage range.
The MICRF302 Parallel Encoder makes the transmission
of encoding data simple. This device encodes data from
four input pins, which have internal pull-up resistors and
deglitching circuitry. These inputs can be connected to
switches or external circuitry. The MICRF302 outputs
encoded data serially, and can be connected directly to
any QwikRadio
®
transmitter without any additional
components.
The MICRF302 gives communication reliability through
built-in CRC (cyclic redundancy check). The MICRF302
needs no external components for clock generation.
Unlike other encoders on the market, there is no shift in
performance with associated changes in operating
temperature nor operating voltage. The internal clock
provides stable data operations over a wide temperature
range of -40°C to +85°C. MICRF302 can operate from
1.8 V to 3.6 V. The MICRF302 is battery friendly, and will
work with alkaline, NiCd, NiMh, lithium ion, or lithium
batteries.
QwikRadio®
Features
•
Small form factor: 10-pin MLF
®
package
•
Wide operating voltage range: 1.8 V to 3.6 V
•
Low current consumption: 130µA operating, 0.1µA
Standby
•
On-chip clock generation requires no external
components
•
Unique 20-bit internal address allows up to 1 million
combinations to differentiate from adjacent encoders.
•
Selectable data rates: 0.6, 1, 3, 4.8kbps
•
8-bit industry-standard CRC provides robust data
protection
•
On-chip pullup resistors
•
On-chip deglitch makes it easy to use low-cost switches
Applications
•
•
•
•
•
•
•
•
•
•
Light switches
Appliance controls
Christmas lights
Fan and HVAC switches
Remote half switches
Garage door openers
Remote controls
Toys
Lawn watering sensors
Robust, unidirectional, low cost, low power, low data
rate communications links
_________________________________________________________________________________________________
Ordering Information
Part Number
MICRF302YML
Note:
1. MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Marking Code
XA02
Temperature Range
-40ºC to +85ºC
Package
10-pin 2.5mm × 2.5mm MLF
®
QwikRadio is a registered trademark of Micrel, Inc.
MLF and MicroLead Frame are registered trademark of Amkor Technology
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
March 2010
M9999-032610-A
Micrel, Inc.
MICRF302
Pin Configuration
®
10-Pin MLF Package
Pin Description
Pin Number
D3
D2
D1
D0
Pin Name
1
2
3
4
Pin Function
Switch Input 3
Switch Input 2
Switch Input 1
Switch Input 0
Typical applications connect D0-D3 to ground with a push-button switch. Unused
switch inputs can just be left unconnected.
D0-D3 are deglitched by the MICRF302; pulses shorter than 8 ms are rejected.
VSS
SEL0
SEL1
5
6
7
Negative Supply (Ground)
Data rate select 0
Data rate select 1
The data rate select pins must be connected to VDD or VSS, and select the data rate
as follows:
00: 600 bps
01: 1 kpbs
10: 3 kbps
11: 4.8 kbps
TXEN
8
Transmitter Enable
The active-high enable turns on a companion transmitter 40 ms before baseband data
transmission starts. This delay allows the Transmitter’s PLLs to lock.
DOUT
VDD
9
10
RF Baseband Data Output
Data from the MICRF302 is Manchester-coded.
Positive Supply
March 2010
3
M9999-032610-A
Micrel, Inc.
MICRF302
Absolute Maximum Ratings
(1)
Supply Voltage (V
DD
) ……………………...…-0.3 V to +4 V
Voltage on Any Pin................... VSS - 0.3 V to VDD + 0.3 V
Junction Temperature ................................-55°C to +150°C
Storage Temperature .................................-65°C to +150°C
Lead Temperature (soldering, 10 s)......................... +300°C
ESD Rating
(3)
......................................................... 2kV HBM
Operating Ratings
(2)
Supply Voltage (V
DD
)...................................... 1.8 V to 3.6 V
Ambient/junction Temperature.....................-40°C to +85°C
Electrical Characteristics
V
IN
= 3.3V; T
A
= 25°C, bold values indicate –40°C
≤
T
A
≤
+85°C, unless noted.
Parameter
Operating Supply Current
Standby Current
Condition
Fully Operational
Chip Disabled
Min
Typ
130
0.3
Max
200
1
Units
µA
µA
Analog Section
MICRF302 Parallel Encoder Timing (Note 4)
On-chip oscillator frequency accuracy
One bit time
One packet time
Delay between data packets
Switch closure to TXEN (TD_TXEN)
Transmit Timeout
(6)
Transmit Enable to Data Out (TTXEN_DOUT)
Pulse rejection (deglitch) by D0-D3 (Note 5)
Does not depend on data rate
Does not depend on data rate
Does not depend on data rate
22.5
36
7.2
Does not depend on data rate
-10
0.9
0
1.0
98
5
<1
25
40
8
27.5
44
8.8
+10
1.1
%
ms
ms
ms
µs
s
ms
ms
Digital Section
Input Low Voltage
Input High Voltage
Output High Voltage
Output Low Voltage
Output Tr, Tf
DOUT and TXEN, Output Current
D0 to D3 pins
D0 to D3 pins
TXEN/DOUT pin, 1µA Load
TXEN/DOUT pin, 1µA Load
TXEN/DOUT pin, Cload = 15pF
Source at 0.8 VDD
Sink at 0.2 VDD
Notes:
1. Exceeding the absolute maximum rating may damage the device
2. The device is not guaranteed to function outside its operating rating
3. This device is ESD sensitive
4. Timing numbers are for a data rate of 1 kbps. Except where shown, all data timing scales linearly with the data rate.
5. In this context, deglitching refers to the D0-D3 pins’ ability to reject high- or low-going glitches. Deglitching makes it much easier to use low-cost
push-to-make switches which have inherently noisy contacts.
6. Guaranteed by design.
0.1 VDD
0.9 VDD
0.9 VDD
0.1 VDD
10
3
10
V
V
V
V
µs
mA
March 2010
4
M9999-032610-A
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
