參數(shù)資料
型號(hào): CLRC632
廠商: NXP Semiconductors N.V.
英文描述: Multiple Protocol Contactless Reader IC
中文描述: 多協(xié)議非接觸式讀卡器IC
文件頁數(shù): 101/163頁
文件大小: 948K
代理商: CLRC632
Philips Semiconductors
Product Specification Rev. 3.0; May 2003
Multiple Protocol Contactless Reader IC
CL RC632
101
Confidential
13.3.2 FORMULA FOR THE SOURCE RESISTANCE
The relative resistance Rs
rel
can be calculated by
GsCfgCW
EXP
GsCfgCW
rel
MANT
Rs
)
(
1
40
77
=
The relative resistance Rs
rel
during the modulation phase can be calculated using
GsCfgMod
, respectively.
13.3.3 CALCULATING THE EFFECTIVE SOURCE RESISTANCE
13.3.3.1 Wiring Resistance
Wiring and bonding add a constant offset to the driver resistance, that is relevant if TX1 and TX2 are
switched to low impedance. The additional resistance for TX1 can be set approximately to
m
Rs
TX
,
wire
500
1
13.3.3.2 Effective Resistance
The source resistances of the driver transistors R
sMaxP
found in the Product Information Field (see chapter
6.2) are measured at production test with
GsCfgCW
set to 01
hex
. To get the driver resistance for a specific
value set in
GsCfgMod
the following formula may be used:
(
max,
,
wire
p
ref
x
Rs
Rs
Rs
=
)
1
,
1
,
TX
wire
rel
TX
Rs
Rs
+
.
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