IC-GF_15 Datasheet, PDF (25/30 Pages) IC-Haus GmbH – TRANSCEIVER

iC-GF
TRANSCEIVER
APPLICATION NOTES
Rev F1, Page 25/30
Setup for medium and small currents at VCC/VCC3
For medium output currents at VCC/VCC3 the inductor
of the switching converter may as well be replaced by a
resistor (see Fig. 14), resulting though in a considerably
less efficiency (power dissipation!) and an elevated
noise level at VH and thus at VCC/VCC3.
VCC3
VCC
..10mA
VH
VHR
170
VHL
CVH
1uF
CVBR
1uF
VBR
Lin. Regulator
DC/DC
Converter
Bias
VBO < VN
VBO
CVBO
100nF
VBO
VCC
VCC3
CVCC
1uF
CVCC3
1uF
NUVD/MISO
NOVL/NDIAG
VCC3
CEM1
100pF
SENSOR
CEM2
100pF
RSET _ISET
8.2K
QCFG1/NCS
INV1/ESPI
IN1/TX
Figure 14: LVH replaced by a resistor
QCFG2/SCLK
VCC3
VCC VBR
Status
Output
Undervoltage
1
Toff
Overload
VCC3
Channel 1
VCC3
Input Interface
VCC3
Channel 2
For small output currents the switching converter can
be bypassed completely (see Fig. 15). Please note the
significantly higher power dissipation in that case.
VCC3
..50mA
VCC VH
VHL
CVBR
1uF
Lin. Regulator
DC/DC
Converter
Bias
VBO < VN
VBO
CVBO
100nF
VBO
IN2/MOSI
OEN
Figure 16: SPI Mode in extremely noisy environ-
ments
Output protection
Figures 17 to 20 show some common configurations
with different wire counts and the respective additional
protective circuitry against transients on the transmis-
sion line; suggested values as follows:
Figure 15: Switching converter bypassed
In extremely noisy environments, additional blocking
capacitors (CEM1, CEM2) can be used to ensure SPI
mode (see Fig. 16).
CQx:
CCFI:
CVBO:
TVSx:
1 nF
1 nF
100 nF
TVS diodes (eg. Vishay GSOT36C)