SCA1000 MURATA | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 14
Technical content
9 ST_2
10 ST_1
12 VDD
6 GND
11 OUT_1
5 OUT_2
1 SCK
3 MISO
4 MOSI
7 CSB
element's proof mass with electrostatic force. o Continuous memory parity check. packaging design, make the SCA1000-N1000070 the ideal choice for challenging inertial sensing applications. Figure 1. Functional block diagram
Murata Electronics Oy Subject to changes 2/14 TABLE OF CONTENTS
Murata Electronics Oy Subject to changes 3/14
1 Electrical Specifications
The product version specific performance specifications are listed in the table SCA1000 performance characteristics below. Vdd=5.00V and ambient temperature unless otherwise specified.
1.1 Absolute Maximum Ratings
Supply voltage (VDD) Voltage at input / output pins Storage temperature Operating temperature Mechanical shock -0.3 V to +5.5V -0.3V to (VDD + 0.3V) -55°C to +125°C -40°C to +125°C Drop from 1 meter onto a concrete surface (20000g). Powered or non-powered
1.2 Performance Characteristics
1.3 Parameter Condition Min(1 Typical Max(1 Units
Measuring range Nominal -4 +4 g Frequency response –3dB LP 60 115 170 Hz Offset (Output at 0g) Ratiometric output Vdd/2 Vdd/2 V Offset Digital Output 1024 LSB Offset Calibration error -20 20 mg Offset Temperature Dependency -40…+125°C 50 50 mg Sensitivity 0.55 V/g Sensitivity Digital Output 226 LSB / g Sensitivity Calibration error -2 +2 % Sensitivity Temperature Dependency Linearity error ±4g range 80 mg ±4g range 160 mg Digital Output Resolution 11 11 Bits Output Noise Density From DC...100Hz 95 120 Hz/g Cross-axis sensitivity Max. -3.5 +3.5 % Note 1. Min/Max values are +/-3 sigma of test population
Murata Electronics Oy Subject to changes 4/14
1.4 Electrical Characteristics
Parameter Condition Min. Typ Max. Units Supply voltage Vdd 4.75 5.0 5.25 V Current consumption Vdd = 5 V; No load 4 5 mA Operating temperature -40 +125 °C Analog resistive output load Vout to Vdd or GND 10 kΩ Analog capacitive output load Vout to Vdd or GND 20 nF Start-up delay Reset and parity check 10 ms
1.5 SPI Interface DC Characteristics
Parameter Conditions Symbol Min Typ. Max Unit Input terminal CSB Pull up current VIN = 0 V IPU 13 22 35 A Input high voltage VIH 4 Vdd+0.3 V Input low voltage VIL -0.3 1 V Hysteresis VHYST 0.23*Vdd V Input capacitance CIN 2 pF Input terminal MOSI, SCK Pull down current VIN = 5 V IPD 9 17 29 A Input high voltage VIH 4 Vdd+0.3 V Input low voltage VIL -0.3 1 V Hysteresis VHYST 0.23*Vdd V Input capacitance CIN 2 pF Output terminal MISO Output high voltage I > -1mA VOH Vdd- 0.5 V Output low voltage I < 1 mA VOL 0.5 V Tri-state leakage 0 < VMISO < Vdd ILEAK 5 100 pA
1.6 SPI Interface AC Characteristics
Parameter Condition Min. Typ. Max. Units Output load @500kHz 1 nF SPI clock frequency 500 kHz Internal A/D conversion time 150 s Data transfer time @500kHz 38 s
1.7 SPI Interface Timing Specifications
Figure 2. Timing diagram for SPI communication
1.8 Electrical Connection
provided from pins OUT_1 and OUT_2. Figure 3. SCA1000 electrical connection
1 SCK Input Serial clock
2 NC Input No connect, left floating
3 MISO Output Master in slave out; data output
4 MOSI Input Master out slave in; data input
5 Out_2 Output Y axis Output (Ch 2)
6 GND Supply Ground
7 CSB Input Chip select (active low)
8 NC Input No connect, left floating
9 ST_2 Input Self test input for Ch 2
10 ST_1 Input Self test input for Ch 1
11 Out_1 Output X axis Output (Ch 1)
12 VDD Supply Positive supply voltage (+5V DC)
2 Functional Description
2.1 Measuring Directions
2.2 Ratiometric Output
the supply voltage. If the SCA1000 supply voltage is fluctuating the SCA1000 output will also vary.
2.3 SPI Serial Interface
always operates as a slave device in master-slave operation mode. for serial data input (MOSI), serial data output (MISO) and serial clock (SCK). Figure 4. The measuring directions of the SCA1000
Figure 5. Typical SPI connection The SPI interface in Murata products is designed to support any micro controller that uses SPI bus. impedance state until the falling edge of CSB. This reinitializes the serial communication.
acceleration signal stored in acceleration data register Y. Figure 6. Command and 11 bit acceleration data transmission over the SPI
2.4 Self Test and Failure Detection Modes
command on the self test input, or through the SPI.
1 V. The self test function must not be activated for both channels at the same time . Figure 7. Self test wave forms V1 = initial output voltage before the self test function is activated. V2 = output voltage during the self test function. initial value after the specified stabilization time. After a longer time (max. 1 second) V1=V3. T5 = Rise time during self test.
2.5 Temperature Measurement
The SCA1000 has an internal temperature sensor, which is used for internal offset compensation.
the temperature measurement is about ±1 °C.
3 Application Information
3.1 Recommended Circuit Diagrams and Printed Circuit Board Layouts
voltage for both the SCA1000 and Analog/Digital converter. Use low pass RC filters with 5.11 kΩ and 10nF on the SCA1000 outputs to minimize clock noise. narrow power supply or GND connection strips on PCB. Figure 8. Analog connection and layout example Figure 9. SPI connection example
3.2 Recommended Printed Circuit Board Footprint
Figure 10. Recommended PCB footprint
4 Mechanical Specifications and Reflow Soldering
4.1 Mechanical Specifications (Reference only)
RoHS compliance: RoHS compliant lead free component. Co-planarity error: 0.1mm max. Figure 11. Mechanical dimensions of the SCA1000 (Dimensions in mm)
4.2 Reflow Soldering
normal SMD pick-and-place equipment. Figure 12. Recommended SCA1000 body temperature profile during reflow soldering. Ref. Average ramp-up rate (TL to TP) 3°C/second max. 3°C/second max. Preheating time and temperatures according to guidance from solder paste manufacturer. error from intended measuring direction during assembly process. Wave soldering is not recommended.