aduc7032 Analog Devices, Inc., aduc7032 Datasheet - Page 47

• Manufacturer Part Number: aduc7032
• Description: Microconverter Integrated, Precision Battery Sensor
• Manufacturer: Analog Devices, Inc.

Preliminary Technical Data
ADC GROUND SWITCH
The ADuC7032 features an integrated ground switch pin,
GND_SW located on 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 20k , 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 20k resistor, and the second showing a direct
connection to ground, via the GND_SW. ADCCFG[7] controls
the connection of the ground switch to ground and
ADCMDE[6] controls the GND_SW resistance.
Figure 17 : Example External Temperature Sensor Circuits
R
NTC
REF
20kŸ
REG_AVDD
VTEMP
NTC
REG_AVDD
VTEMP
Rev. PrD | Page 47 of 128
The possible combinations are shown in Table 18.
ADCCFG[7]
0
0
1
1
Figure 18: Internal Ground Switch Configuration
ADCMDE[6]
Table 18 : GND_SW Configuration
GND_SW
0
1
0
1
20kŸ
Connected to ground via 20k
Direct connection to Ground
ADCCFG[7]
ADCMDE[6]
GND_SW
Floating
Floating
resistor
ADuC7032