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參數(shù)資料
| 型號： | MCRF202 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 125 kHz Passive RFID Device with Sensor Input |
| 中文描述： | 的125 kHz無源RFID器件，傳感器輸入 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 340K |
| 代理商： | MCRF202 |
2003 Microchip Technology Inc.
DS21308E-page 5
MCRF202
2.2
Configuration Register and
Control Logic
The configuration register determines the operational
parameters of the device. It directly controls logic
blocks which generate the baud rate, memory size,
encoded data, modulation protocol, etc. CB11 is
always a zero. Once the array is successfully pro-
grammed at the factory, the lock bit CB12 is set. When
the lock bit is set, programming and erasing the device
becomes permanently disabled. Table 2-1 contains a
description of the control register bit functions.
2.2.1
BAUD RATE TIMING OPTION
The chip will access data at a baud rate determined by
bits CB2, CB3, and CB4 of the configuration register.
For example, MOD32 (CB2 =
0
, CB3 =
1
, CB4 =
1
) has
32 RF cycles per bit. This gives the data rate of 4 kHz
for the RF carrier frequency of 128 kHz.
2.2.2
DATA ENCODING OPTION
This logic acts upon the serial data being read from the
EEPROM. The logic encodes the data according to the
configuration bits CB6 and CB7. CB6 and CB7 deter-
mine the data encoding method. The available choices
are:
Non-return to zero-level (NRZ_L)
Biphase_S (Differential)
Biphase_L (Manchester)
Inverted Manchester
2.2.3
MODULATION OPTION
CB8 and CB9 determine the modulation protocol of the
encoded data. The available choices are:
ASK
FSK
PSK_1
PSK_2
When ASK (direct) option is chosen, the encoded data
is fed into the modulation transistor without change.
When FSK option is chosen, the encoded data is rep-
resented by:
a)
Sets of 10 RF carrier cycles (first 5 cycles
→
higher amplitude, the last 5 cycles
→
lower
amplitude) for logic “high” level.
b)
Sets of 8 RF carrier cycles (first 4 cycles
→
higher amplitude, the last 4 cycles
→
lower
amplitude) for logic “l(fā)ow” level.
For example, FSK signal for MOD40 is represented:
a)
4 sets of 10 RF carrier cycles for data ‘
1
’.
b)
5 sets of 8 RF carrier cycles for data ‘
0
’.
Refer to Figure 2-2 for the FSK signal with MOD40
option.
The PSK_1 represents change in the phase of the
modulation signal at the change of the encoded data.
For example, the phase changes when the encoded
data is changed from ‘
1
’ to ‘
0
’, or from ‘
0
’ to ‘
1
’.
The PSK_2 represents change in the phase at the
change on ‘
1
’. For example, the phase changes when
the encoded data is changed from ‘
0
’ to ‘
1
’, or from ‘
1
’
to ‘
1
’.
FIGURE 2-2:
ENCODED DATA AND FSK OUTPUT SIGNAL FOR MOD40 OPTION
Encoded Data ‘
1
’
Encoded Data ‘
0
’
40 RF cycles
40 RF cycles
5 cycles (HI)
5 cycles (LO)
4 cycles (HI)
4 cycles (LO)
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相關(guān)代理商/技術(shù)參數(shù) |
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| MCRF202-I/P | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:125 kHz Passive RFID Device with Sensor Input |
| MCRF202-I/S | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:125 kHz Passive RFID Device with Sensor Input |
| MCRF202-I/SB | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:125 kHz Passive RFID Device with Sensor Input |
| MCRF202-I/SN | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:125 kHz Passive RFID Device with Sensor Input |
| MCRF202-I/W | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:125 kHz Passive RFID Device with Sensor Input |
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