ADUC7034BCPZ-RL Analog Devices Inc, ADUC7034BCPZ-RL Datasheet - Page 43

• Manufacturer Part Number: ADUC7034BCPZ-RL
• Description: IC,Battery Management,LLCC,48PIN,PLASTIC
• Manufacturer: Analog Devices Inc
• Series: MicroConverter® ADuC7xxxr

Specifications of ADUC7034BCPZ-RL

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 20.48MHz
• Connectivity: LIN, SPI, UART/USART
• Peripherals: POR, PSM, Temp Sensor, WDT
• Number Of I /o: 9
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K 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 ADuC7034 features an integrated ground switch pin,
GND_SW (Pin 15). This switch allows the user to dynamically
disconnect the ground from external devices and instead use
either a direct connection to ground or a connection to ground
via a 20 kΩ resistor. If the latter option is chosen, the additional
resistor can be used to reduce the number of external components
required for an NTC circuit. In addition, the ground switch
feature can be used to reduce power consumption on application-
specific boards.
An example application is shown in Figure 19.
Figure 19 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 the GND_SW.
ADCCFG[7] controls the connection of the ground switch to
ground, and ADCMDE[6] controls the GND_SW resistance, as
shown in Figure 20.
Table 31. Typical Output RMS Noise of Current Channel ADC in Normal Power Mode
ADCFLT
0xBF1D
0x961F
0x007F
0x0007
0x0000
1
Table 32. Typical Output RMS Noise (Referred to ADC Voltage Attenuator Input) of Voltage Channel ADC
ADCFLT
0xBF1D
0x961F
0x0007
0x0000
Table 33. 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 19. Example External Temperature Sensor Circuits
Data
Update
Rate
4 Hz
10 Hz
50 Hz
1 kHz
8 kHz
R
NTC
REF
20kΩ
±2.3 mV
(512)
0.040 μV
0.060 μV
0.142 μV
0.620 μV
2.000 μV
REG_AVDD
VTEMP
GND_SW
Data Update Rate
4 Hz
10 Hz
1 kHz
8 kHz
Data Update Rate
4 Hz
10 Hz
1 kHz
8 kHz
NTC
±4.6 mV
(256)
0.040 μV
0.060 μV
0.142 μV
0.620 μV
2.000 μV
REG_AVDD
VTEMP
GND_SW
±4.68 mV
(128)
0.043 μV
0.060 μV
0.144 μV
0.625 μV
2.000 μV
±18.75 mV
(64)
0.045 μV
0.065 μV
0.145 μV
0.625 μV
2.000 μV
Rev. B | Page 43 of 136
ADC Input Range (Gain Setting)
±37.5 mV
(32)
0.087 μV
0.087 μV
0.170 μV
0.770 μV
2.650 μV
The possible combinations of ADCCFG[7] and ADCMDE[6]
are shown in Table 30.
Table 30. GND_SW Configuration
ADCCFG[7]
0
0
1
1
ADC NOISE PERFORMANCE TABLES
Table 31, Table 32, and Table 33 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.
±75 mV
(16)
0.175 μV
0.175 μV
0.305 μV
1.310 μV
4.960 μV
Figure 20. Internal Ground Switch Configuration
2.8 μV
7.5 μV
55 μV
0 V to 1.2 V ADC Input Range
2.8 μV
28.8 V ADC Input Range
65 μV
65 μV
180 μV
1600 μV
ADCMDE[6]
0
1
0
1
GND_SW
±150 mV
(8)
0.35 μV
0.35 μV
0.380 μV
1.650 μV
8.020 μV
20kΩ
GND_SW
Floating
Floating
Direct connection to ground
Connected to ground via 20 kΩ
resistor
±300 mV
(4
0.7 μV
0.7 μV
0.7 μV
2.520 μV
15.0 μV
1
ADCCFG[7]
)
ADCMDE[6]
±600 mV
(2
1.4 μV
1.4 μV
2.3 μV
7.600 μV
55.0 μV
1
)
ADuC7034
±1.2 V
(1
2.8 μV
2.8 μV
2.8 μV
7.600 μV
55.0 μV
1
)