IC-GF Datasheet, PDF (22/26 Pages) IC-Haus GmbH – TRANSCEIVER

iC-GF
TRANSCEIVER
APPLICATION NOTES
Rev C1, Page 22/26
Setup for medium and small currents at VCC/VCC3
For medium output currents at VCC/VCC3 the induc-
tor of the switching converter may as well be replaced
by a resistor (see Fig. 14), resulting though in a con-
siderably 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
Figure 14: LVH replaced by a resistor
For small output currents the switching converter can
be bypassed completely (see Fig. 15).
VCC3
..50mA
VCC VH
VHL
CVBR
1uF
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
QCFG2/SCLK
IN2/MOSI
OEN
VCC3
VCC VBR
Status
Output
Undervoltage
1
Toff
Overload
VCC3
Channel 1
VCC3
Input Interface
VCC3
Channel 2
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)