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D03Rev2.3

DMT proprietary & confidential: product information is subject to change without notice.

Domintech Co., Ltd. Tel: +886-2-2290-1288 Fax: +886-2-2290-1266 http://www.domintech.com.tw

DMARD03 Low-g Tri-Axial Digital Accelerometer

General Description

DMARD03 is a low-g tri-axial digital accelerometer for cost-sensitive consumer appliance.

DMARD03 contains in a compact plastic LGA package a sensing element and a conditioning CMOS

IC. The sensing element is a MEMS device by proprietary piezoresistive technology. The CMOS IC

provides SPI and I2C digital interface and interrupt signals with build-in functionality. DMARD03 can be

deployed without further user interference in most applications

Features

 Tri-axial digital accelerometer with ±3g dynamic range

 11 bit ADC embedded with SPI (4-wire) and I2C digital interface

 Temperature sensor for internal compensation and capable of digital output

 Low operation voltage of +2.4V ~ +3.6V with minimum interface voltage of +1.7V

 Low power consumption (Operation: typical 250uA@3V, Stand-by: Max. 5uA)

 Two interrupt pins configurable from three interrupt sources: freefall, click and high-G

 Freefall detection with user settable threshold

 6-direction click detection with user settable threshold

 3-direction motion detection (high-G) with configurable logic combination and threshold setting

 User selectable bandwidth and pin-controllable standby mode

 5000g shock tolerance



20-pin LGA package with RoHS compliance and lead-free. Footprint 4mm×4mm, height 1.2mm.

Applications

Display orientation switching, click sensing, menu scrolling, HDD protection, mobile phone, gaming,

smart toys, etc.

Figure 1: DMARD03

Summary of content (19 pages)

PAGE 1
D03Rev2.3 DMARD03 Low-g Tri-Axial Digital Accelerometer General Description DMARD03 is a low-g tri-axial digital accelerometer for cost-sensitive consumer appliance. DMARD03 contains in a compact plastic LGA package a sensing element and a conditioning CMOS IC. The sensing element is a MEMS device by proprietary piezoresistive technology. The CMOS IC provides SPI and I2C digital interface and interrupt signals with build-in functionality.
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D03Rev2.
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D03Rev2.3 Internal sampling rate 1/Tms User selectable 342, 684 Hz Detection response time User selectable Tms ms Bandwidth Freefall threshold Click threshold Mechanical DC Electrical See Bandwidth Table 8 Hz Default — 523 — mg Settable @ 7.8mg step 7.8 — 996 mg Default — 2.0 — g 0.25 — 3.
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D03Rev2.3 Connection Diagram Figure 2: Block Diagram of DMARD03 Figure 3: I2C Connection Example 4 DMT proprietary & confidential: product information is subject to change without notice. Domintech Co., Ltd. Tel: +886-2-2290-1288 Fax: +886-2-2290-1266 http://www.domintech.com.
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D03Rev2.3 Figure 4: SPI Connection Example 5 DMT proprietary & confidential: product information is subject to change without notice. Domintech Co., Ltd. Tel: +886-2-2290-1288 Fax: +886-2-2290-1266 http://www.domintech.com.
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D03Rev2.3 User Registers End users can read sensor outputs, control sensor behaviors and query the interrupt status by accessing the user registers. DMARD03 provides two digital interfaces, i.e. SPI 4-wire and I2C, for easy accessing these registers. The registers primarily consist of three categories: data, control and interrupt status registers. Sensor output values can be read from the data registers. The sensor behavior can be configured by setting up respective control registers.
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D03Rev2.3 Data Registers Temperature and acceleration output values can be read from the data registers. The sensor output is converted to an 11-bit value and stored across two register bytes. Data representation is 2's complement, i.e. MSB 1 means negative values. Data is periodically updated with sampling period which is user-settable, and data registers will keep their values intact when digital interface (SPI or I2C) is accessed.
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D03Rev2.3 enabled. When the freefall interrupt is enabled, DMARD03 will watch closely the acceleration values of all three axes as compared to some threshold. The INTx pin will directly reflect the comparison result, in other words the result is not latched. The INTx pin will be logic-1 if all three acceleration magnitudes are below the designated threshold value, which potentially indicates a freefall in process.
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D03Rev2.3 Table 8: Bandwidth Table N[1:0] (08h:bit1, 0) Hz 00 01 10 Tms 0 19 38 76 (08h: bit2) 1 38 76 153 11 No Filter High-G Detection HGXEn, HGYEn, HGZEn (09h:bit6, 5, 4) are the X-, Y-, and Z-axis high-G interrupt enable control bits respectively. If the respective high-G interrupt enable bit is set to 1, high-G monitoring is enabled for the respective axis. Upon enabled, DMARD03 will check closely if the acceleration magnitude of the respective axis exceeds some high-G threshold value.
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D03Rev2.3 Click Interrupt Enable CLXEn, CLYEn, CLZEn (09h:bit2, 1, 0) are the X-, Y-, and Z-axis click interrupt enable control bits respectively. If the respective click interrupt enable bit is set to 1, click monitoring is enabled for the respective axis. DMARD03 will check closely if the respective axis acceleration value double crosses some click threshold. In such case a click event is detected on the way of second cross. On detection the configured INT× pin will be latched to logic-1.
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D03Rev2.3 Source Configure”, "Freefall Interrupt Enable" and "Freefall Threshold" for proper register setup. High-G Interrupt Flag HGInt (0Ch:bit6) is the high-G interrupt flag. The high-G interrupt flag serves the same purpose and manner as the configured INTx pin. This flag can be read via the SPI/I2C digital interface, and therefore is an alternative to the INTx pin if end users have GPIO constraint. See “INT1 and INT2 Source Configure” and “High-G Detection” for proper register setup.
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D03Rev2.3 proper register setup. Figure 5: X-axis Click Event Trigger Example Y-axis Click Flag YCLP (0Dh:bit3) and YCLN (0Dh:bit2) are Y-axis positive and negative direction click flag. They work in analog to XCLP and XCLN. Z -axis Click Flag ZCLP (0Dh:bit1) and ZCLN (0Dh:bit0) are Z-axis positive and negative direction click flag. They work in analog to XCLP and XCLN. 12 DMT proprietary & confidential: product information is subject to change without notice. Domintech Co., Ltd.
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D03Rev2.3 Digital Interface DMARD03 provides two digital interfaces (SPI 4-wire and I2C) and an interrupt output signal for easy configuration and data/status query. The digital interface can be used to regularly read the data registers of acceleration and temperature output. The DMARD03 can also be configured by setting up proper control registers via the digital interface. For example, the interrupt pin can be configured to response to freefall or click event.
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D03Rev2.3 Table 10: I2C access format I2C Specifications Table 11: I2C Timing Specification Parameter Symbol Minimum Typical Maximum Unit SCL clock frequency SCL — — 400 kHz Clock low period tLOW 1.2 — — µs Clock high period tHIGH 0.6 — — µs Bus free to new start tBUF 1.2 — — µs Start hold time tHD.STA 0.6 — — µs Start setup time tSU.STA 0.6 — — µs Data-in hold time tHD.DAT 0 — — µs Data-in setup time tSU.DAT 100 — — ns Stop setup time tSU.STO 0.
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D03Rev2.3 Figure 6: I2C Timing Diagram SPI Interface The SPI interfaces using four-wire bus provide 22-bit protocols. Multiple read/write is supported. The communication starts with a read/write (R/W) control bit with R/W equals 0 for writing or 1 for reading. Following the R/W control bit comes a 13-bit address and an 8-bit data for single read/write, as shown in Figure 7 & 8.
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D03Rev2.3 Figure 8: SPI Single Write Figure 9: SPI Multiple Read Figure 10: SPI Multiple Write 16 DMT proprietary & confidential: product information is subject to change without notice. Domintech Co., Ltd. Tel: +886-2-2290-1288 Fax: +886-2-2290-1266 http://www.domintech.com.
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D03Rev2.3 Package Outline Dimension Figure 11: Package Outline Dimension 17 DMT proprietary & confidential: product information is subject to change without notice. Domintech Co., Ltd. Tel: +886-2-2290-1288 Fax: +886-2-2290-1266 http://www.domintech.com.
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D03Rev2.3 Axes Orientation Figure 12: Axes Orientation of DMARD03 RoHS Compliance The 20-pin LGA package conforms to the EU directive on the restriction of the use of certain hazardous substances in electrical and electronic equipment 2002/95/EC. Surface Mounting Information The accelerometer is sensitive to the mechanical and thermal stress, so proper PCB board design and well-executed soldering processes are crucial to ensure consistent performance.
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D03Rev2.3 individual applications to decide what degree of offset shift they may tolerate. For best consistency, it is recommended to do an on-board calibration after the accelerometer is soldered. Additional information is available upon request. Figure 13: Layout Recommendation for PCB Land Pad and SR Open Figure 14: Recommendation of Soldering Temperature Profile 19 DMT proprietary & confidential: product information is subject to change without notice. Domintech Co., Ltd.