原标题：APC330 Si4438低成本无线数传模块

　　APC330采用集成度非常高的射频芯片Si4438，其在性能与成本之间取得了极佳的平衡，性价比优势极为突出，在1Kbps速率下的接收灵敏度高达-120dBm，丝毫不逊于同类成本高昂的产品;APC330采用高效的循环交织纠检错编码(CRC)，使其保有了非常高的抗干扰能力，非常适用于对性能要求高且对成本要求极为苛刻的智能电能表无线抄表。

　　APC330尺寸与引脚均兼容APC250、APC320，使得Si4438, Si4432, Si4463模块产品得以灵活使用和自由替换。

　　特点：

　　1500米传输距离(9600bps)

　　支持频率433MHz, 470MHz

　　100mW发射功率(可设置)

　　超低接收灵敏度-111dBm@10Kbps, 120dBm@1Kbps

　　调制方式GFSK

　　采用UART/TTL接口, RS232, RS485可选

　　多频道可设, 收发256Bytes数据缓冲区

　　工作电压3.4 -5.5V

　　电流消耗 19.5mA(接收), 95mA(发射), 2.5uA(待机)

　　二种工作模式, 收发与休眠模式快速切换

　　内置看门狗

　　尺寸 32.1*18.3*7.0(mm)

　　应用：

　　无线抄表, 智能电表无线手抄、组网集抄系统

　　无线电子点餐机、点菜机

　　各种温度、流控、压力、位置、角度仪表通信监测

　　住宅及各种建筑物智能控制, 工业自动化数据采集

　　安防、报警系统, 各种基础设施监控管理

　　油井、矿山实时监测, 通信系统配电监测、无功补偿系统

【Si4438】

HIGH-PERFORMANCE, LOW-CURRENT TRANSCEIVER

Features

> Frequency range = 425–525 MHz

> Receive sensitivity = –124 dBm

> Modulation

》(G)FSK

》OOK

> Max output power

》+20 dBm

> Low active power consumption

》14 mA RX

> Ultra low current powerdown modes

》30 nA shutdown, 50 nA standby

> Data rate = 100 bps to 500 kbps

> Fast wake and hop times

> Power supply = 1.8 to 3.6 V

> Excellent selectivity performance

》58 dB adjacent channel

》75 dB blocking at 1 MHz

> Antenna diversity and T/R switch control

> Highly configurable packet handler

> TX and RX 64 byte FIFOs

> Auto frequency control (AFC)

> Automatic gain control (AGC)

> Low BOM

> Low battery detector

> Temperature sensor

> 20-Pin QFN package

> IEEE 802.15.4g ready

> China regulatory

Applications

> China smart meters

Description

Silicon Laboratories' Si4438 is a high-performance, low-currenttransceivers covering the sub-GHz frequency bands from 425 to525 MHz. The Si4438 is targeted at the Chinese smart meter market andis especially suited for electric meters. This device is footprint- andpin-compatible with the Si446x radios, which provide industry-leadingperformance for worldwide sub-GHz applications. The radios are part ofthe EZRadioPRO® family, which includes a complete line of transmitters,receivers, and transceivers covering a wide range of applications. Allparts offer outstanding sensitivity of –124 dBm while achieving extremelylow active and standby current consumption. The 58 dB adjacent channelselectivity with 12.5 kHz channel spacing ensures robust receiveoperation in harsh RF conditions. The Si4438 offers exceptional outputpower of up to +20 dBm with outstanding TX efficiency. The high outputpower and sensitivity results in an industry-leading link budget of 144 dBallowing extended ranges and highly robust communication links.

Functional Block Diagram