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| 型號(hào)： | U2270B |
| 英文描述： | Read / Write Base Station IC |
| 中文描述： | 讀/寫基站集成電路 |
| 文件頁數(shù)： | 4/13頁 |
| 文件大?。?/td> | 146K |
| 代理商： | U2270B |
U2270B
TELEFUNKEN Semiconductors
Rev. A3, 13-Dec-96
4 (13)
The following section explains the 3 different
operation modes to power the U2270B.
1.
One-rail operation
All internal circuits are operated from one 5-V power rail.
(see figure 5). In this case, V
S
,V
EXT
and DV
S
serve as
inputs. V
Batt
is not used but should also be connected to
that supply rail.
D
VS
V
EXT
V
S
V
Batt
Standby
+5 V (stabilized)
12579
Figure 5.
2.
In that application, the driver voltage, DV
S,
and the
pre-driver supply, V
EXT
, are operated at a higher voltage
than the rest of the circuitry to obtain a higher
driver-output swing and thus a higher magnetic field,
refer to figure 6. V
S
is connected to a 5-V supply, whereas
the driver voltages can be as high as 8 V. This operation
mode is intended to be used in situations where an
extended communication distance is required.
Two-rail operation
D
VS
V
EXT
V
S
V
Batt
Standby
5 V (stabilized)
12580
7 to 8 V (stabilized)
Figure 6.
3.
Battery-voltage operation
Using this operation mode, V
S
and V
EXT
are generated by
the internal power supply. (refer to figure 7). For this
mode, an external voltage regulator is not needed. The IC
can be switched off via the pin Standby. V
EXT
supplies the
base of an external NPN transistor and external circuits,
i.e., a microcontroller (even in Standby mode).
Pin V
EXT
and V
Batt
are overvoltage protected via internal
Zener diodes (refer figure 4).The maximum current into
that pins is determined by the maximum power dissipa-
tion and the maximum junction temperature of the IC. For
a short-time current pulse, a higher power dissipation can
be assumed (refer to application note ANT019).
D
VS
V
EXT
V
S
V
Batt
Standby
12600
7 to 16 V
Figure 7.
Table 1. The following table summarizes the characteristics of the various operation modes.
Operation Mode
External Components Re-
quired
Supply Voltage Range
Driver Output
Voltage Swing
Standby Mode
Available
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1. One-rail operation
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6 V to 16 V
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2. Two-rail operation
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6 V to 7 V
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No
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operation
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4 V
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Yes
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| U2270B_08 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Read/Write Base Station |
| U2270B-MFP | 功能描述:IC RFID BASEREADER 125KHZ 16SOIC RoHS:否 類別:RF/IF 和 RFID >> RFID IC 系列:U2270B 其它有關(guān)文件:CR14 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- RF 型:收發(fā)器 頻率:13.56MHz 特點(diǎn):ISO14443-B 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SO 包裝:Digi-Reel® 其它名稱:497-5719-6 |
| U2270B-MFPG3 | 功能描述:IC BASEREADER RFID 125KHZ 16SOIC RoHS:是 類別:RF/IF 和 RFID >> RFID IC 系列:U2270B 其它有關(guān)文件:CR14 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- RF 型:收發(fā)器 頻率:13.56MHz 特點(diǎn):ISO14443-B 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SO 包裝:Digi-Reel® 其它名稱:497-5719-6 |
| U2270B-MFPG3Y | 功能描述:射頻無線雜項(xiàng) Base Station RoHS:否 制造商:Texas Instruments 工作頻率:112 kHz to 205 kHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 電源電流:8 mA 最大功率耗散: 工作溫度范圍:- 40 C to + 110 C 封裝 / 箱體:VQFN-48 封裝:Reel |
| U2270B-MFPY | 功能描述:射頻無線雜項(xiàng) Base Station RoHS:否 制造商:Texas Instruments 工作頻率:112 kHz to 205 kHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 電源電流:8 mA 最大功率耗散: 工作溫度范圍:- 40 C to + 110 C 封裝 / 箱體:VQFN-48 封裝:Reel |
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