PEB3265 Infineon Technologies Corporation, PEB3265 Datasheet - Page 129

• Manufacturer Part Number: PEB3265
• Description: (PEB326x / PEB426x) Dual Channel Slicofi-2 / Slic Duslic
• Manufacturer: Infineon Technologies Corporation

Preliminary
• Apply Ring Offset voltage RO2 to Ring and Tip line by setting bits RNG-OFFSET[1:0]
• Enable the levelmeter by setting bit LM-EN in register LMCR1 to 1.
• Read the result registers LMRES1 and LMRES2
The actual current I
The capacitance C
Example:
LM
LM
I
C
4.8.2.12 Line Capacitance Measurements Ring and Tip to GND
The voltage ramp can be applied to either line, whereas the other line is set to high
impedance by setting bits HIR and HIT in register BCR1 accordingly. That way
capacitance measurements from Ring and Tip to GND may be accomplished.
Because of one line being high impedance, the actual line current will be twice the
calculated one (multiplication by a factor of 2 necessary).
4.8.2.13 Foreign- and Ring Voltage Measurements
The DuSLIC supports two user-programmable input/output pins (IO3, IO4) which can be
used for measuring external voltages. If the pins IO3 and/or IO4 are led properly over a
voltage divider to the Ring- and Tip wire, foreign voltages from external voltage sources
supplied to the lines can be measured on either pin, even a differential measurement will
be supported (IO4-IO3). The selection of which input information shall be taken for the
measurement is done via bits LM-SEL[3:0] in configuration register LMCR2
Data Sheet
I
C
CMeasure
CMeasure
Measure
Measure
in register LMCR3 to 10.
– Comment: The voltage ramp starts at RO1 and ramps up/down until RO2 is
Value
Result
achieved. After the integration time, the result will be stored within LMRES1 and
LMRES2 registers.
= 0x3AF2 = 15090
= 0.4605
= 1,842 mA/200 V/s = 9.21 µF
= 2*2 mA*0.4605 = 1.842 mA
=
=
I
-------------------------
2
CMeasure
dU
------- -
dt
I
LM DC
Measure
CMeasure
LM
calculates as:
amounts to:
Result
129
Operational Description
(Table
2000-07-14
DuSLIC
36).