Brief Description:

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

• Symbol rate：0.5 - 40 kbps

• Output power：0 - +13 dBm

• Working current：5.5 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