參數(shù)資料
型號(hào)： MC33690
廠商： Motorola, Inc.
英文描述： Standalone Tag Reader Circuit
中文描述： 獨(dú)立標(biāo)簽讀寫器電路
文件頁(yè)數(shù)： 7/24頁(yè)
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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參數(shù)描述
MC33690DWE 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC STAND ALONE TAG READER RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):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(fēng)格:SMD/SMT
MC33690DWER2 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC STAND ALONE TAG READER RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):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(fēng)格:SMD/SMT
MC33696FCAE 功能描述:射頻收發(fā)器 UHF TRANSCEIVER RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)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(fā)器 UHF TRANSCEIVER ECHO RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)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(fā)器 PLL Tuned UHF Recvr RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)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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