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參數資料
| 型號： | MC33690 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Standalone Tag Reader Circuit |
| 中文描述： | 獨立標簽讀寫器電路 |
| 文件頁數： | 7/24頁 |
| 文件大小： | 442K |
| 代理商： | MC33690 |
Go to: www.freescale.com
revision 4.8, 5 February 2002
Motorola, Inc., 2002.
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 in parallel with the
internal LDMOS. The threshold voltage of this
transistor must be lower than the one of the
internal LDMOS (1.95V typ.) in order 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 also the input generating the
internal reset signal. Applying a logic low level on
this pin resets the circuit :
- all the internal flip flops are reset,
- the drivers TD1/2 are switched on.
Figure 4 : Voltage regulator block diagram
1MHz oscillator
Charge pump
Voltage reference
and biasing
generator
+
-
VSUP
GATE
SOURCE
VDD
Comparator
N channel
LDMOS
P channel
MOS
+
-
LVR
VBAT
C
1
VDD
10
μ
F 10
0n
F
C
3
C
2
10
μ
A
VDD
C
Reset
VDD
reset
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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相關代理商/技術參數 |
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| MC33690DWE | 功能描述:數字信號處理器和控制器 - DSP, DSC STAND ALONE TAG READER RoHS:否 制造商:Microchip Technology 核心:dsPIC 數據總線寬度:16 bit 程序存儲器大小:16 KB 數據 RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數量:35 定時器數量:3 設備每秒兆指令數:50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風格:SMD/SMT |
| MC33690DWER2 | 功能描述:數字信號處理器和控制器 - DSP, DSC STAND ALONE TAG READER RoHS:否 制造商:Microchip Technology 核心:dsPIC 數據總線寬度:16 bit 程序存儲器大小:16 KB 數據 RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數量:35 定時器數量:3 設備每秒兆指令數:50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風格:SMD/SMT |
| MC33696FCAE | 功能描述:射頻收發器 UHF TRANSCEIVER RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數據速率:2000 Kbps 調制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray |
| MC33696FCAER2 | 功能描述:射頻收發器 UHF TRANSCEIVER ECHO RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數據速率:2000 Kbps 調制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray |
| MC33696FCE | 功能描述:射頻收發器 PLL Tuned UHF Recvr RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數據速率:2000 Kbps 調制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray |
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