aduc7030 Analog Devices, Inc., aduc7030 Datasheet - Page 51

• Manufacturer Part Number: aduc7030
• Description: Integrated Precision Battery Sensor For Automotive
• Manufacturer: Analog Devices, Inc.

Preliminary Technical Data
ADC GROUND SWITCH
The ADuC7030/ADuC7033 features an integrated ground
switch pin, GND_SW, pin15. This switch allows the user to
dynamically disconnect ground from external devices. It allows
either a direct connection to ground, or a connection to ground
via a 20 k:. This additional resistor may be used to reduce the
number of external components required for an NTC circuit.
The ground switch feature may be used for reducing power
consumption on application specific boards.
An example application is shown in Figure 17. This diagram
shows an external NTC used in two modes, one using the
internal 20 k: resistor, and the second showing a direct
connection to ground, via the GND_SW. ADCCFG[7] controls
Figure 17. Example External Temperature Sensor Circuits
R
NTC
REF
20kŸ
REG_AVDD
VTEMP
NTC
REG_AVDD
VTEMP
Rev. PrE | Page 51 of 150
the connection of the ground switch to ground and
ADCMDE[6] controls the GND_SW resistance.
The possible combinations are shown in Table 24.
Table 24. GND_SW Configuration
ADCCFG[7]
0
0
1
1
Figure 18. Internal Ground Switch Configuration
ADCMDE[6]
0
1
0
1
GND_SW
20kŸ
GND_SW
Direct connection to Ground
Connected to ground via 20 kΩ
resistor
Floating
Floating
ADuC7030/ADuC7033
ADCCFG[7]
ADCMDE[6]