SLRC400 Datasheet, PDF (86/130 Pages) NXP Semiconductors – I·CODE Reader IC

Philips Semiconductors
I•CODE Reader IC
Product Specification Rev. 2.0 November 2001
SL RC400
13.2.1.2 Formula for the Source Resistance
The relative resistance Rs_rel is about
Rs _rel
=
1
MANT_GsConfCW
⋅( ) 77 EXPGsConfCW
40
13.2.1.3 Calculating the Effective Source Resistance
13.2.1.3.1 Wiring Resistance
Wiring and bonding adds a constant offset to the driver resistance, that is relevant if TX1 and TX2 are
switched to low impedance.
Rs _wire,TX1 ≈ 500mΩ
13.2.1.3.2 Effective Resistance
The source resistances of the driver transistors found in the Product Information Field (see 6.2) are
measured at production test with GsModCW set to 01_hex. To get the driver resistance for a specific value set
in GsModCW the following formula may be used:
( ) Rs_x = Rs_{ref ,max, n} − Rs_wire,TX1 ⋅ Rs _rel + Rs_wire,TX1 .
86
Preliminary