欢迎访问ic37.com |
会员登录 免费注册
发布采购

BCM20738A1KFBG 参数 Datasheet PDF下载

BCM20738A1KFBG图片预览
型号: BCM20738A1KFBG
PDF下载: 下载PDF文件 查看货源
内容描述: [On-chip support for common keyboard and mouse interfaces eliminates external processor]
分类和应用:
文件页数/大小: 42 页 / 3615 K
品牌: CYPRESS [ CYPRESS ]
 浏览型号BCM20738A1KFBG的Datasheet PDF文件第7页浏览型号BCM20738A1KFBG的Datasheet PDF文件第8页浏览型号BCM20738A1KFBG的Datasheet PDF文件第9页浏览型号BCM20738A1KFBG的Datasheet PDF文件第10页浏览型号BCM20738A1KFBG的Datasheet PDF文件第12页浏览型号BCM20738A1KFBG的Datasheet PDF文件第13页浏览型号BCM20738A1KFBG的Datasheet PDF文件第14页浏览型号BCM20738A1KFBG的Datasheet PDF文件第15页  
CYW20738  
1.8.4 External Reset  
The CYW20738 has an integrated power-on reset circuit that completely resets all circuits to a known power-on state. An external  
active low reset signal, RESET_N, can be used to put the CYW20738 in the reset state. The RESET_N pin has an internal pull-up  
resistor and, in most applications, it does not require that anything be connected to it. RESET_N should only be released after the  
VDDO supply voltage level has been stabilized.  
Figure 5. External Reset Timing  
Pulse width  
>50 µs  
RESET_N  
Crystal  
warm-up  
delay:  
~ 5 ms  
Baseband Reset  
Start reading EEPROM and  
firmware boot  
Crystal Enable  
1.9 Integrated Radio Transceiver  
The CYW20738 has an integrated radio transceiver that is optimized for 2.4 GHz Bluetooth® wireless systems. It has been designed  
to provide low power, low cost, and robust communications for applications operating in the globally available 2.4 GHz unlicensed  
ISM band. It is fully compliant with Bluetooth Low Energy Radio Specification and meets or exceeds the requirements to provide the  
highest communication link quality of service.  
1.9.1 Transmitter Path  
The CYW20738 features a fully integrated transmitter. The baseband transmit data is GFSK modulated in the 2.4 GHz ISM band.  
Digital Modulator  
The digital modulator performs the data modulation and filtering required for the GFSK signal. The fully digital modulator minimizes  
any frequency drift or anomalies in the modulation characteristics of the transmitted signal.  
Power Amplifier  
The CYW20738 has an integrated power amplifier (PA) that can transmit up to +4 dBm for class 2 operation.  
1.9.2 Receiver Path  
The receiver path uses a low IF scheme to downconvert the received signal for demodulation in the digital demodulator and bit  
synchronizer. The receiver path provides a high degree of linearity, an extended dynamic range, and high-order, on-chip channel  
filtering to ensure reliable operation in the noisy 2.4 GHz ISM band. The front-end topology, which has built-in out-of-band attenuation,  
enables the CYW20738 to be used in most applications without off-chip filtering.  
Digital Demodulator and Bit Synchronizer  
The digital demodulator and bit synchronizer take the low-IF received signal and perform an optimal frequency tracking and bit  
synchronization algorithm.  
Receiver Signal Strength Indicator  
The radio portion of the CYW20738 provides a receiver signal strength indicator (RSSI) to the baseband. This enables the controller  
to take part in a Bluetooth power-controlled link by providing a metric of its own receiver signal strength to determine whether the  
transmitter should increase or decrease its output power.  
Document Number: 002-14891 Rev. *C  
Page 11 of 42