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IC-MSA Datasheet, PDF (15/29 Pages) IC-Haus GmbH – SIN/COS SIGNAL CONDITIONER with AGC and 1Vpp DRIVER | |||
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iC-MSA SIN/COS SIGNAL
preliminary
CONDITIONER with AGC and 1Vpp DRIVER
BIAS SOURCE AND TEMPERATURE SENSOR CALIBRATION
Rev A1, Page 15/29
Bias Source Calibration
The calibration of the bias current source in operation
mode Calibration 1 (Tab. 13) is prerequisite for adher-
ence to the given electrical characteristics and also in-
strumental in the determination of the chip timing (e.g.
SCL clock frequency). For setup purposes the IBN
value is measured using a 10 k⦠resistor by pin VDDS
connected to pin NC. The setpoint is 200 µA which is
equivalent to a measurement voltage of 2 V.
The necessary activation threshold voltage VTth(T1) is
then calculated. The required warning temperature T2,
temperature coefï¬cients TCs and TCth (see Electrical
Characteristics, Section E) and measurement value
VTs(T1) are entered into this calculation:
VTth(T1)
=
VTs(T1) + TCs · (T2 â T1)
1 + TCth · (T2 â T1)
CFGIBN
Code k
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
Adr 0x41, bit 7:4
IBN
â¼
31
39âk
79 %
81 %
84 %
86 %
88 %
91 %
94 %
97 %
Code k
0x8
0x9
0xA
0xB
0xC
0xD
0xE
0xF
IBN
â¼
31
39âk
100 %
103 %
107 %
111 %
115 %
119 %
124 %
129 %
Table 11: Bias Current Source Calibration
Temperature Sensor
The temperature monitor is calibrated in operating
mode Calibration Mode 3.
To set the required warning temperature T2 the tem-
perature sensor voltage VTs at which the warning is
generated is ï¬rst determined. To this end a volt-
age ramp from VDDS towards GNDS is applied to
pin PS until pin ERR triggers an error message (for
EMASKA = 0x20 and EMTD = 0x00).
Example: VTs(T1) is ca. 650 mV, measured from
VDDS versus PS, with T1 = 25 °C;
Example: For T2 = T1 + 100 K, VTth(T1) must be pro-
grammed to 443 mV.
Activation threshold voltage VTth(T1) is provided for a
high impedance measurement (10 Mâ¦) at output pin
NS (measurement versus VDDS) and must be set by
programming CFGTA(3:0) to the calculated value.
Example: Altering VTth(T1) from 310 mV (measured
with CFGTA(3:0)= 0x0) to 443 mV is equivalent to
143 %, the closest value for CFGTA is 0x9;
CFGTA
Code k
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
Notes
Adr 0x41, bit 3:0
VTth
â¼
65+3k
65
100 %
Code k
0x8
VTth
â¼
65+3k
65
140 %
105 %
0x9
145 %
110 %
0xA
150 %
115 %
0xB
155 %
120 %
0xC
160 %
125 %
0xD
165 %
130 %
0xE
170 %
135 %
0xF
175 %
With CFGTA = 0xF Toff is 80 °C typ.,
with CFGTA = 0x0 Toff is 155 °C typ.
Table 12: Calibration of Temperature Monitoring
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