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参数资料
| 型号： | MC33690DWE |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 7/26页 |
| 文件大小： | 0K |
| 描述： | IC STAND ALONE TAG READER 20SOIC |
| 标准包装： | 38 |
| RF 型： | 读/写 |
| 频率： | 125kHz |
| 特点： | 电源电压范围广 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC W |
| 包装： | 管件 |
Write Function
reference is the falling edge of the driving signal TD1, this leads to a sampling time phase ranging from ? 78.75 ° to 90 ° with
discrete steps of 11.25 ° . After reset condition, the sampling time phase is + 11.25 ° .
The antenna phase shift evaluation is only done after each wake-up command or after reset. This is necessary to obtain the best
demodulator performances.
To ensure a fast demodulator settling time after wake-up, reset, or a write sequence, the external capacitor CEXT is preloaded
at its working voltage. This preset occurs 256μs after switching the antenna drivers on and its duration is 128μs. After wake-up
or reset, the preset has the same duration, but begins 518μs after clock settling. After power on reset, VSUP must meet the
minimum specified value, enabling the nominal operation of VDD, before the start of the preset. Otherwise, the preset must be
done through a standby/wake-up sequence.
3
Write Function
Whatever the selected configuration (see Section 6, “Communication Modes Description” ), the write function is achieved by
switching on/off the output drivers TD1/2. After the drivers have been set in high impedance, the load current flows alternatively
through the internal diodes to VSS and to VDD (see Figure 3 ).
V DD
R A
TD1
I LOAD
L A
R 1
V DD
C A
TD2
Figure 3. Current Flow When Buffers are Switched Off
4
Voltage Regulator
The low dropout voltage regulator provides a regulated 5V supply for the internal circuitry. It can also supply external
peripherals or sensors. The input supply voltage ranges from 5.5V to over 40V.
This voltage regulator uses a series combination of high voltage LDMOS and low voltage PMOS transistors to provide
regulation. An external low ESR capacitor is required for the regulator stability.
The maximum average current is limited by the power dissipation capability of the SO 20 package. This limitation can be
overcome by connecting an external N channel MOS parallel with the internal LDMOS. The threshold voltage of this transistor
must be lower than the one of the internal LDMOS (1.95V typ.) to prevent the current from flowing into the LDMOS. Its
breakdown voltage must be higher than the maximum supply voltage.
A low-voltage reset function monitors the VDD output. An internal 10μA pull-up current source allows, when an external
capacitor is connected between LVR and GND, to generate delays at power up (5ms typ. with C Reset = 22nF). The LVR pin is
MC33690 Standalone Tag Reader Circuit, Rev. 5
Freescale Semiconductor
7
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相关代理商/技术参数 |
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| MC33690DWER2 | 功能描述:数字信号处理器和控制器 - DSP, DSC STAND ALONE TAG READER RoHS:否 制造商:Microchip Technology 核心:dsPIC 数据总线宽度:16 bit 程序存储器大小:16 KB 数据 RAM 大小:2 KB 最大时钟频率:40 MHz 可编程输入/输出端数量:35 定时器数量:3 设备每秒兆指令数:50 MIPs 工作电源电压:3.3 V 最大工作温度:+ 85 C 封装 / 箱体:TQFP-44 安装风格:SMD/SMT |
| MC33696FCAE | 功能描述:射频收发器 UHF TRANSCEIVER RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray |
| MC33696FCAER2 | 功能描述:射频收发器 UHF TRANSCEIVER ECHO RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray |
| MC33696FCE | 功能描述:射频收发器 PLL Tuned UHF Recvr RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray |
| MC33696FCER2 | 功能描述:射频收发器 PLL Tuned UHF Recvr RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray |
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