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PDF AK8998 Data sheet ( Hoja de datos )
| Número de pieza | AK8998 | |
| Descripción | Pressure sensor compensation and excitation IC | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AK8998 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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Preliminary
[AK8998/W/D]
AK8998/W/D
The AK8998 is a pressure sensor interface IC that features compensation for temperature drift and sensor
variation. It is designed to excite and interface to a bridge sensor. Variations in the sensor can be
corrected via compensation values stored in integrated non-volatile memory (EEPROM). Compensation
values are obtained from measurement results for a set of offset voltages and temperature drift, along with
a set of bridge voltages and temperature drift, including characteristics of the AK8998. The AK8998 is
available in a 16-pin QFN package, in wafer form and in a tray.
Features
• Pressure sensor compensation and excitation IC (Analog output)
• Supply voltage current: 7.1mA max @10kHz sampling
• Supply voltage: 3.0V±5%, 3.3V±5%, 5.0V±5%
• Operating temperature range: -20 to 85ºC
• Integrated sensor output compensation (AK8998 Input conversion)
• Offset voltage adjustment
- Adjustment range: Rough ±13 to ±373mV / Fine ±1 to ±34mV @5.0V
- Adjustment step: Rough 2 to 53mV /step / Fine 0.01 to 0.27mV /step @5.0V
• Offset voltage temperature drift adjustment (1st order coefficient)
- Adjustment range: ±0.04 to ±1.23mV/ºC @5.0V
- Adjustment step: 0.2 to 4.8µV/ºC @5.0V
• Output span voltage adjustment (G1, G2, G3)
- Total adjustment range: 5.7 to 261.6mV @5.0V
- G1 adjustment step :
0.95 to 74.7mV /step @5.0V
- G2 adjustment step :
5.7 to 130.8mV /step @5.0V
- G3 adjustment step :
0.01 to 0.40mV /step @5.0V
• Sensitivity temperature drift adjustment (1st order coefficient)
- Adjustment range: -4000ppm/ºC to +2500ppm/ºC or -2500ppm/ºC to +1000ppm/ºC
- Adjustment step: 18ppm/ºC step
• Integrated output reference voltage adjustment function
- Adjustment range: 0.02*VDD to 0.98*VDD
- Adjustment step: 10mV /step @5.0V
• Integrated sampling frequency switching function: 1kHz, 10kHz
• Integrated analog circuit reference voltage stabilizer
(Add an external capacitor to AGND pin as needed)
• SCF and SMF included for band limitation: fc:1.0kHz, 500Hz, 250Hz
• 2 wire serial interface (CSCLK, VOUT)
• Ratiometric voltage output
• Integrated constant voltage source for pressure sensor: 2.2V @ 3.0, 3.3V±5%
4.0V or 2.2V @ 5.0V±5%
• Integrated pressure detectors (x2)
- Detection threshold adjustment control
- Adjustment range: 0.125*VDD to 0.9*VDD
- Adjustment step: 0.025*VDD /step
- Detection threshold external setting function (DET2 / PTH pin use)
- hysteresis voltage adjustment control
- Adjustment range: 0.03*VDD to 0.06*VDD
- Adjustment step: 0.01*VDD /step
• Integrated reference voltage & reference current generator
- VREF voltage adjustment control
- Resolution: 3bits
- Adjustment step: 1% /step
MSxxxxx-E-00
-1-
2012/11
1 page  
[AK8998/W/D]
Adjustment Characteristics
1) Sensor Characteristics
■VDD: 5V
Item
Symbol
Drive voltage
Svs1
Svs2
Temperature range
Sta
Sensor resistance
Sres1
Sres2
Voltage input span
Sspnin1
range
Sspnin2
Offset voltage
Soff1
adjustment range
Soff2
Sensitivity temp. drift Sst1
coefficient
Sst2
Offset temp. drift
Sot1
coefficient
Sot2
Min.
-20
0.82
1.00
12.00
17.00
-15.00
-35.00
-4000
-2500
-0.040
-0.080
Typ.
2.2
4.0
4.00
4.00
44.00
70.00
0.00
0.00
0.00
0.00
Max.
85
6.50
6.50
76.00
125.00
15.00
35.00
2500
1000
0.040
0.080
units
V
V
°C
kΩ
kΩ
mV
mV
mV
mV
ppm/°C
ppm/°C
mV/°C
mV/°C
Comments
EVD[1:0]=1h
EVD[1:0]=0h
EVD[1:0]=1h
EVD[1:0]=0h
Sensor1
Sensor2
Sensor1
Sensor2
ESTC[0]=1h
ESTC[0]=0h
Sensor1
Sensor2
■VDD:3, 3.3V
Item
Symbol Min.
Typ.
Max. units
Comments
Drive voltage
Svs
2.2 V
Temperature range
Sta
-20
85 °C
Sensor resistance
Voltage input span
range
Sres
Sspnin1
Sspnin2
0.82
6.60
9.00
4.00
24.20
40.00
6.50
41.80
70.00
kΩ
mV Sensor1
mV Sensor2
Offset voltage
adjustment range
Soff1
Soff2
-8.25
-19.25
0.00
0.00
8.25
19.25
mV Sensor1
mV Sensor2
Sensitivity temp. drift
coefficient
Sst1
Sst2
-4000
-2500
2500
1000
ppm/°C ESTC[0]=1h
ppm/°C ESTC[0]=0h
Offset temp. drift
coefficient
Sot1
Sot2
-0.022
0.00
0.022 mV/°C Sensor1
-0.044
0.00
0.044 mV/°C Sensor2
Note) The usage combines characteristics of senser 1/2 is not allowed. Such a case as Span voltage is
said as the sensor 1 and except is said as the sensor 2).
MSxxxxx-E-00
-5-
2012/11
5 Page 
[AK8998/W/D]
VDD: 5V (ESTC[0]=1h)
Level Diagram
VP G1
VN G=10
G2(D2S)
G=1.5
G3
G=0.6*3.0
LPF
G=1
S/H & SCF & Level Shift
G=2
ING1=5 - 70
ING2=1.5, 3.0
1) Level Shift : 0.02*VDD, Pressure : Positive
+/-400mV
1200mV
720mV
2160mV
LVS=0.02*VDD - 0.98*VDD
2160mV
Level
Shift
0.93*VDD
VP-VN=80mV
0.5*VDD
4320mV
Buffer &
SMF
G=1.111
VOUT
VO
4800mV
2) Level Shift : 0.98*VDD, Pressure : Negative
+/-400mV
1200mV
VP-VN=80mV
0.5*VDD
720mV
2160mV
2160mV
4320mV
0.02*VDD
0.98*VDD
4800mV
3) Level Shift : 0.5*VDD, Pressure : Positive & Negative
+/-200mV
600mV
360mV
1080mV
VP-VN=40mV
0.5VDD
1080mV
Lev el
Shift
0.068*VDD
2160mV
2400mV
MSxxxxx-E-00
- 11 -
2012/11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AK8998.PDF ] | |
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