PGA400-Q1
SLDS186 –MARCH 2012
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UNIT
5.4 Sensor Supply
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
VBRG SUPPLY FOR RESISTIVE BRIDGE SENSORS
VBRG
RBRG
CBRG
Supply Voltage
0.44 kΩ ≤ RBRG ≤ 20 kΩ
3.2
3.33
3.4
V
Resistive Bridge Resistance
Capacitive Load
0.44
20
500
40
KΩ
pF
RBRG = 20 kΩ
Line regulation
VDD = 4.5V, 5.5V, RBRG = 0.44 kΩ
VDD = 5.0 V, 10 µA ≤ ILOAD ≤ 10 mA
-40
-40
mV
mV
Load regulation
40
ICAPx SUPPLY FOR CAPACITIVE SENSORS
CI[2:0] = 000, ICAP_V = 100 mV
CI[2:0] = 001, ICAP_V = 100 mV
CI[2:0] = 010, ICAP_V = 100 mV
CI[2:0] = 011, ICAP_V = 100 mV
CI[2:0] = 100, ICAP_V = 100 mV
CI[2:0] = 101, ICAP_V = 100 mV
CI[2:0] = 110, ICAP_V = 100 mV
CI[2:0] = 111, ICAP_V = 100 mV
CI[2:0] = 000, ICAP_V = 3.2 V
CI[2:0] = 001, ICAP_V = 3.2 V
CI[2:0] = 010, ICAP_V = 3.2 V
CI[2:0] = 011, ICAP_V = 3.2 V
CI[2:0] = 100, ICAP_V = 3.2 V
CI[2:0] = 101, ICAP_V = 3.2 V
CI[2:0] = 110, ICAP_V = 3.2 V
CI[2:0] = 111, ICAP_V = 3.2 V
-5.3
-8
-4.3
-6.6
-10.8
-13.5
-16.2
-18.9
-21.6
-24.4
4.5
-8.8
-11.1
-13.3
-15.5
-17.8
-20.1
5.6
Supply Current Amplitude on ICAP,
TA = 25°C
µA
ICAP_A
6.9
8.5
9.2
11.3
14.1
16.7
19.2
22.1
24.8
+5.0
110
11.5
13.6
15.8
18.1
20.4
-5.0
70
Variation over temperature
%
CV[1:0] = 00
CV[1:0] = 01
CV[1:0] = 10
CV[1:0] = 11
90
300
500
700
255
345
CPx_V,
CRx_V
Capacitive Sensor Drive - Voltage at
CPx and CRx pins
mV
425
575
595
805
SELF OSCILLATING CURRENT MODE DEMODULATOR FOR CAPACITIVE SENSORS
CR[1:0] = 00, RREF = 78 kΩ
-1.07
-2.13
-4.24
-8.45
-1.01
-1.97
-3.93
-7.85
-0.94
-1.82
-3.63
-7.26
CR[1:0] = 01, RREF = 78 kΩ
RF / RREF Gain in Transimpedance amplifier
V/V
pF
CR[1:0] = 10, RREF = 78 kΩ
CR[1:0] = 11, RREF = 78 kΩ
Feedback Capacitor in
Transimpedance amplifier
Cf
14
16
18
5.5 Temperature Sensor
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
°C
Temperature Range
–40
150
Temperature ADC Resolution
Temperature ADC Update Rate
10
8
bits
ms
(1)
Gain
2.7
-105
-4
2.8
2.9
-66
4
LSB/°C
LSB
°C
(1)
Offset
Total Error
(1) The Temperature ADC Value is given by the equation: ADC Code = Gain*Temperature (in °C) + Offset
6
ELECTRICAL CHARACTERISTICS
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