ADUC7036BCPZ-RL Analog Devices Inc, ADUC7036BCPZ-RL Datasheet - Page 45

• Manufacturer Part Number: ADUC7036BCPZ-RL
• Description: Flash 96k ARM7 Dual 16-Bit ADC LIN I.C.
• Manufacturer: Analog Devices Inc
• Series: MicroConverter® ADuC7xxxr

Specifications of ADUC7036BCPZ-RL

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 20.48MHz
• Connectivity: LIN, SPI, UART/USART
• Peripherals: PSM, Temp Sensor, WDT
• Number Of I /o: 9
• Program Memory Size: 96KB (96K x 8)
• Program Memory Type: FLASH
• Ram Size: 6K x 8
• Voltage - Supply (vcc/vdd): 3.5 V ~ 18 V
• Data Converters: A/D 2x16b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 115°C
• Package / Case: 48-LFCSP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADC GROUND SWITCH
The ADuC7036 features an integrated ground switch pin,
GND_SW (Pin 15). This switch allows the user to dynamically
disconnect ground from external devices and, instead, use either
a direct connection to ground or a connection to ground using
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 20.
Figure 20 shows an external NTC used in two modes, with one
using the internal 20 kΩ resistor and the second showing a direct
connection to ground via GND_SW.
ADCCFG[7] controls the connection of the ground switch to
ground, and ADCMDE[6] controls GND_SW resistance, as
shown in Figure 21.
Table 32. Typical Output RMS Noise of Current Channel ADC in Normal Power Mode
ADCFLT
0xBF1D
0x961F
0x007F
0x0007
0x0000
1
Table 33. Typical Output RMS Noise (Referred to ADC Voltage Attenuator Input) of Voltage Channel ADC
ADCFLT
0xBF1D
0x961F
0x0007
0x0000
Table 34. Typical Output RMS Noise of Temperature Channel ADC
ADCFLT
0xBF1D
0x961F
0x0007
0x0000
The maximum absolute input voltage allowed is −200 mV to +300 mV, relative to ground.
Figure 20. Example External Temperature Sensor Circuits
R
Data
Update
Rate
4 Hz
10 Hz
50 Hz
1 kHz
8 kHz
NTC
REF
20kΩ
REG_AVDD
VTEMP
GND_SW
±2.3 mV
(512)
0.040
0.060
0.142
0.620
2.000
μV
μV
μV
μV
μV
NTC
Data Update Rate
4 Hz
10 Hz
1 kHz
8 kHz
Data Update Rate
4 Hz
10 Hz
1 kHz
8 kHz
±4.6 mV
(256)
0.040
0.060
0.142
0.620
2.000
μV
μV
μV
μV
μV
REG_AVDD
VTEMP
GND_SW
±4.68 mV
(128)
0.043
0.060
0.144
0.625
2.000
μV
μV
μV
μV
μV
±18.75 mV
(64)
0.045
0.065
0.145
0.625
2.000
Rev. C | Page 45 of 132
μV
μV
μV
μV
μV
±37.5 mV
(32)
0.087
0.087
0.170
0.770
2.650
ADC Input Range
The possible combinations of ADCCFG[7] and ADCMDE[6]
are shown in Table 31.
Table 31. GND_SW Configuration
ADCCFG[7]
0
0
1
1
ADC NOISE PERFORMANCE TABLES
Table 32, Table 33, and Table 34 list the output rms noise in
microvolts for some typical output update rates on the I-ADC
and V-/T-ADC. The numbers are typical and are generated at
a differential input voltage of 0 V. The output rms noise is specified
as the standard deviation (or 1 Σ) of the distribution of ADC
output codes collected when the ADC input voltage is at a dc
voltage. It is expressed in microvolts rms (μV rms).
μV
μV
μV
μV
μV
65 μV
65 μV
180 μV
1600 μV
0 V to 1.2 V ADC Input Range
2.8 μV
2.8 μV
7.5 μV
55 μV
±75 mV
(16)
0.175
0.175
0.305
1.310
4.960
28.8 V ADC Input Range
Figure 21. Internal Ground Switch Configuration
ADCMDE[6]
0
1
0
1
μV
μV
μV
μV
μV
GND_SW
±150 mV
(8)
0.35
0.35
0.380
1.650
8.020
μV
μV
μV
μV
μV
20kΩ
GND_SW
Floating
Direct connection to ground
Connected to ground via 20 kΩ
resistor
Floating
±300 mV
(4
0.7
0.7
0.7
2.520
15.0
ADCCFG[7]
1
)
μV
μV
μV
μV
ADCMDE[6]
μV
±600 mV
(2
1.4
1.4
2.3
7.600
55.0
1
)
μV
μV
μV
ADuC7036
μV
μV
±1.2 V
(1
2.8
2.8
2.8
7.600
55.0
1
)
μV
μV
μV
μV
μV