OOK Transmitter. CMT2157B Datasheet

CMT2157B Transmitter. Datasheet pdf. Equivalent

CMT2157B Datasheet
Recommendation CMT2157B Datasheet
Part CMT2157B
Description 240MHz - 960MHz Single Chip OOK Transmitter
Feature CMT2157B; CMT2157B CMT2157B 240 MHz-960 MHz Single Chip OOK Transmitter with Encoder Instruction: CMT2157B i.
Manufacture CMOSTEK
Datasheet
Download CMT2157B Datasheet




CMOSTEK CMT2157B
CMT2157B
CMT2157B
240 MHz-960 MHz Single Chip OOK Transmitter with Encoder
Instruction:
CMT2157B is a single chip, high flexibility,
ultra-low power consumption, OOK RF chip with
encoder. It is ideal for wireless applications
between 240 MHz to 960 MHz. The chip is fully
compatible with the most commonly used coding
formats such as 527, 1527, 2262 and 2240 in the
market. In addition, it also supports various
user-defined coding. The chip supports 4
freestanding buttons or up to 10 scanning
buttons. Every key value can be individually
configured. There is no diode isolation between
the key combinations. The chip defaults to 1527
encoding and operates at 433.92 MHz when it is
shipped. Users can also use the visual operation
interface RFPDK and the burner provided by
CMOSTEK to solidify the customized
parameters into the EEPROM inside the chip to
realize the differential applications. CMT2157B
is one of the NextGenRF™ series products of
CMOSTEK. When it is paired with the CMT221x
series receiver chip, the low cost, low power
consumption and high performances required by
the user can be effectively met.
Applications:
Low cost applications in the consumer
electronics and appliances
Automatic control of homes and
buildings
Fan remote control
Infrared transmitter replacement
Industrial monitoring and control
Wireless lighting control system
Wireless alarm and security system
Remote Keyless Entry (RKE)
Features:
Build-in EEPROM
Simplify the engineering development by
using RFPDK
All functions can be configured
Working frequency240 MHz ~960 MHz
Symbol rate0.5 - 40 kbps
Output power0 - +13 dBm
Working current5.5 mA @ +10 dBm
Sleep current< 20 nA
The chip runs independently without external
MCU control.
Support the common encodings such as 527,
1527, 2240, 2262 and the packet formats
defined by users.
4 independent pins support as many as 10
buttons, key values can be arbitrary.
LED instruction when transmitting.
FCC / ETSI Compliant
RoHS Compliant
SOP package with 14 pins
Ordering information
Product No.
Frequency Package MOQ
CMT2157B-ESR 433.92 MHz
SOP14
/ Braid
2,500pcs
For more ordering information, please see
page18.
SOP14
CMOSTEK Microelectronics Co., Ltd.
Version 0.1 | 1/23 Pages
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CMOSTEK CMT2157B
CMT2157B
LED
VDD
GND
RFO
NC
NC
NC
1
2
3
4
5
6
7
14 XTAL
13 NC
12 NC
11 K1/CSB
10 K2/ CLK
9 K3/ DATA
8 K4
CMT2157B PIN ARRANGEMENT DIAGRAM
Pin No.
1
2
3
4
5,6,7,12,13
8
9
10
11
14
Name
LED
VDD
GND
RFO
NC
K4
K3
K2
K1
XTAL
I/O Description
IO
LED driving
Burner port and enabled pin
I Supply voltage input
I Ground
O RF output
- No connected
I Button 4
I Button 3DATA pin of burner port. Used to burn EEPROM.
I Button 2CLK pin of burner port. Used to burn EEPROM.
I Button 1CSB pin of burner port. Used to burn EEPROM.
I
Crystal pin. Connect the crystal oscillator of the 15PF load capacitor to ground,
or connect a suitable external clock source.
Version 0.1 | 2/23 Pages
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CMOSTEK CMT2157B
Typical Application:
CMT2157B
Optional: 10 buttons
connection way.
Note: connector J1 is used
for EEPROM production.
Figure1. CMT2157B Typical Application Schematic Diagram
No.
U1
X1
C0
C5
C1
C2
L1
L2
D1
R0
S[9:0]
Table1. 315 MHz /433.92 MHz Low Cost Application BOM
Description
CMT2157B, 240-960 MHz independent OOK
transmitter with encoder
±20 ppm, SMD32*25 mm crystal, load cap
=15pF
±20%, 0402 X7R, 25 V
±20%, 0402 X7R, 25 V
±5%, 0402 NP0, 50 V
±5%, 0402 NP0, 50 V
±5%, 0603 stacked inductor
±5%, 0603 stacked inductor
D0603, red LED
Button
Component Value
315MHz
433.92MHz
Unit
--
26.250
26.2982
0.1
1
82 82
9.1 9.1
180 180
39 27
-
0
-
MHz
uF
nF
pF
pF
nH
nH
-
-
Supplier
CMOSTEK
EPSON
Murata GRM15
Murata GRM15
Murata GRM15
Murata GRM15
Murata LQG18
Murata LQG18
-
-
Version 0.1 | 3/23 Pages
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