EVAL-ADUC7032QSPZ Analog Devices Inc, EVAL-ADUC7032QSPZ Datasheet - Page 40

• Manufacturer Part Number: EVAL-ADUC7032QSPZ
• Description: EVAL DEV QUICK START ADUC7032
• Manufacturer: Analog Devices Inc
• Series: QuickStart™ PLUS Kitr
• Type: MCUr

Specifications of EVAL-ADUC7032QSPZ

• Contents: Evaluation Board, Power Supply, Cable, Software, Emulator and Documentation
• For Use With/related Products: ADuC7032
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADuC7032-8L
ADC GROUND SWITCH
The ADuC7032-8L features an integrated ground switch pin,
GND_SW, located on Pin 15. 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 kΩ resistor. This additional resistor can be used to reduce
the number of external components required for an NTC circuit.
The ground switch feature can 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 mode uses the
internal 20 kΩ resistor, and the second mode shows 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.
R
NTC
REF
Figure 17. Example of External Temperature Sensor Circuits
20kΩ
REG_AVDD
VTEMP
GND_SW
NTC
REG_AVDD
VTEMP
GND_SW
Rev.0 | Page 40 of 116
The possible bit combinations are shown in Table 31.
Table 31. GND_SW Configuration
ADCCFG[7]
0
0
1
1
Figure 18. Internal Ground Switch Configuration
ADCMDE[6]
0
1
0
1
GND_SW
20kΩ
GND_SW
Floating.
Floating.
Direct connection to ground.
Connected to ground via a 20 kΩ
resistor.
ADCCFG[7]
ADCMDE[6]