Receiver Input: Rxin; Impedance Converter Output/Input: Ve/Vesrd; Reference Circuit Riref, Rvccve, Rvreg, Risoll - Siemens ASIC SIM 1-2 Function Manual

Functional Description of the SIM 1-2
2.3.5

Receiver Input: RXIN

The received signal is coupled into the input filter over the external capacitor C
(220 pF) and R
2.3.6

Impedance Converter Output/Input: VE/VESRD

These two connectors must be directly connected with each other and then over
R with the collector of the external transistor T1 and the external energy
SENSEP
storage CVE. The voltage at VE/VESRD is regulated to a constant 6.3 V.
2.3.7

Reference Circuit RIREF, RVCCVE, RVREG, RISOLL

Connect the contacts to the specified reference resistors.
Contact
RIREF
RVCCVE
RVREG
RISOLL
Notice:
The tolerance of reference resistors is included in the tolerance of the bus current.
You can achieve the minimum tolerance of 3 % with resistors that have a tolerance
of ≤ 0.1 %. As an alternative, the bus current can be adjusted over R
20
(10 kΩ).
EX1
Reference
resistor
All internal references are derived from the current
R
RIREF
flowing through R
R R
RVCCVE RVCCVE
RVCCVE pin must be backed up to GND by
capacitor C
R R forms the reference for VREG. The RVREG
RVREG RVREG
pin must be backed up to GND by capacitor C
R R sets the middle current taken from the bus
RISOLL RISOLL
system.
Meaning
.
RIREF
forms the reference for VCC and VE. The
.
RVCCVE
RXIN
.
VREG
.
RISOLL
SIM 1-2
C79000-G8976-C215-01