SCA103T ETC1

Document overview

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Technical content

Note 1. For maximum accuracy the supply voltage should be 5 ± 0.05 V. 100nF supply ﬁltering capacitor should be used. Note 2. The measuring range is limited by sensitivity, offset and supply voltage rails of the device. Note 3. Measuring direction parallel to mounting plane, arrow showing positive direction. Note 4. Offset speciﬁed as Voffset = Vout(0g) [ V ]. See note 12. Note 5b. Sensitivity speciﬁed as Vsens = {Vout(+0.5g) - Vout(-0.5g)}/1 [ V/g ]. See note 12 Note 6a. Offset calibration error speciﬁed as Offset_Calib_error = {Vout(0g) – Vdd/2} / Vsens [ g ]. Note 6b. Offset temperature error speciﬁed as Offset Error @ temp. = {Vout @ temp. – Vout @ room temp.} / Vsens [ g ] Vsens = Nominal sensitivity. See note 12. Note 7a. Sensitivity calibration error speciﬁed as Sensitivity_calibr_error = { Vsens - Vsens_nom} / Vsens_nom x 100% [%] Vsens_nom = nominal sensitivity Note 7b. Sensitivity temperature error speciﬁed as Sensitivity error @ temp = { [Vsens @ temp –Vsens @ room temp] / Vsens @ room temp x 100% [ % ]. See note 12. Note 8. From straight line through sensitivity calibration points. Note 9. The output has true DC (0Hz) response. Note 10. The ratiometric error is speciﬁed as: Note 11. The cross-axis sensitivity determines how much inclination / acceleration, perpendicular to the measuring axis, couples to the output. The total cross-axis sensitivity is the geo- metric sum of the sensitivities of the two axis which are perpendicular to the measuring axis. Note 12. In addition, supply voltage noise couples to the output due to the ratiometric nature of the accelerometer . Note 13. Factory calibration value. Note 14. Power continuously connected. Note 15. Is valid between angles 0° to 1°.

FEATURES

High sensitivity by differential analog output or digital output via SPI. Single ended signal available by using a differential ampliﬁer or digitally using internal 11 bit digital output and external micro controller .
Available ranges ±15°,±30°
Over damped frequency response (-3dB @ 8...28 Hz)
Integrated temperature sensor , accessible via SPI
Digitally activated electrostatic sensing element self test
Continuous memory parity check
Advanced internal and external connection failure detection
Single +5V supply; ratiometric analog voltage outputs
Serial Peripheral Interface (SPI) compatible digital output
DIL -12 plastic SMD package, lead-free reﬂow solderable BENEFITS
High immunity to external interference and noise supply voltage.
Improved temperature dependency and long term stability
Excellent reliability and stability over time and temperature
Instrumentation grade performance
High resolution and low noise
Wide operating temperature range
Outstanding overload and shock durability

APPLICATIONS

Single axis inclination instruments
Inclination based position measurement Rev. 6 Apr 2005 VTI Technologies reserves the right to modify this speciﬁcation without prior to notice.

ELECTRICAL CHARACTERISTICS

Electrical characteristics Condition Min Typ Max Units Supply voltage Vdd (1 4.75 5.0 5.25 V Current consumption Vdd = 5 V; No load 4 5 mA Analog resistive output load Vout to Vdd or Vss 10 kOhm Analog capacitive output load 20 nF Digital output load @ 500kHz clock 1 nF SPI clock frequency 500 kHz AD conversion time 150 µs Data transfer time @500 kHz clock 38 µs PERFORMANCE CHARACTERISTICS D/S Performance characteristics Condition SCA103T -D04 SCA103T -D05 Units D Measuring range (2 Nominal ±15 ±0.26 ±30 ±0.5 g D Measuring direction (3 Mounting plane horizontal Horizontal Horizontal S Zero point (4 Mounting position Vdd/2 Vdd/2 V D Sensitivity @ room temperature 280(15 16(5a 140(15 8(5b mV/° V/g S Offset calibration accuracy (6a, 13 @ room temperature 0.057 0.11 mg D Offset temperature dependency (6b, 13 0...70°C < ± 0.11 < ±2 < ±0.11 < ±2 mg D -25…85°C < ±0.14 < ±2.5 < ±0.14 < ±2.5 mg < ±5 < ±0.29 < ±5 mg S Sensitivity calibration accuracy (7a, 13 @ room temperature ±0.5 ±0.5 % D Sensitivity temperature error (7b, 13 -40...85°C -1…1 -1…1 % D Typical non-linearity (8 Over measuring range ±T.B.D ±T.B.D ±0.11 mg S Cross-axis sensitivity (11 @ room temperature 4 4 % S Frequency response –3dB (LP) (9 @ room temperature 8…28 8…28 Hz D Digital output resolution Effective Differential 0.009 0.017 °/LSB Bits D Long term stability (14 @ steady temp < 0.014 < 0.014 ° Parameters marked as D are measured in differential mode using external differential ampliﬁer . The performance of selected ampliﬁer may have an effect to some parameters. Differential signal is determined as a Out_diff = Out_1 – Out_2 (pin 11 – pin 5). VDD = 5.00 V, APPLIES TO BOTH CHANNELS UNLESS OTHERWISE SPECIFIED

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SCA103T ETC1

Document overview

Technical content

FEATURES

APPLICATIONS

ELECTRICAL CHARACTERISTICS

1 SCK Input Serial clock

2 Ext_C_1 Input Channel 1 external capacitor input

3 MISO Output Master in slave out; data output

4 MOSI Input Master out slave in; data input

5 Out_2 Output Channel 2 output

6 VSS Power Negative supply voltage (VSS)

7 CSB Input Chip select (active low)

8 Ext_C_2 Input Channel 2 external capacitor input

9 ST_2 Input Self test input for Channel 2

10 ST_1 Input Self test input for Channel 1

11 Out_1 Output Channel 1 output

12 VDD Power Positive supply voltage (VDD)

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