Datasheet EVB90609-x2 Mixed Mode Gyroscope Evaluation Board Scope This datasheet describes the schematic, the layout and the use of the series of small breakout boards for MLX90609 angular rate sensor. It is fully applicable to EVB90609-N2, EVB90609-E2 and EVB90609-R2 boards and can be used as reference for populating the EVB90609 board. General Description Figure 1. Top view of EVB90609 board. EVB90609-x2 PCB is a small board, which uses the MLX90609 chip in a typical configuration. It can be directly connected to customer’s system to ease the development process. The EVB90609-x2 boards provide the possibility to work both in analogue and in digital mode. Both modes are available on different connector pins of the board. Next to the MLX90609 chip the board includes several passive components which are recommended according to the typical schematic. The board communicates with outside world through edge-type 14 pin connector. Pin names, numbers and functions are explained in table 1. Detailed Description Variants There are 3 variants of the EVB90609-x2 board, which differ only in MLX90609 chip type used (see Table 2). Table 2. Board variants Board Order option “xx” Chip type Note EVB90609 N2 MLX90609N2 75 deg/s full range EVB90609 E2 MLX90609E2 150 deg/s full range EVB90609 R2 MLX90609R2 300 deg/s full range For more information about the MLX90609 chip and its operation, check the MLX90609 datasheets at www.melexis.com. 3901190609A Rev 005 Page 1 of 3 May-09 Datasheet EVB90609-x2 Mixed Mode Gyroscope Evaluation Board Pinout Table 1. Pin out of the edge connector Pin Number Pin Name Pin Function 1 VCC Power pin +5V 2 VCC Power pin +5V 3 VREF Internal reference voltage 4 SCLK Cock for SPI 5 OUTAR Angular rate output voltage 6 -SS Slave select for SPI (negative logic) 7 OUTTMP Temperature output voltage 8 MISO Master-input-slave-output signal for SPI 9 SLFT1 Self test selection pin 1 10 MOSI Master-output-slave-input-signal for SPI 11 SLFT2 Self test selection pin 2 12 ERROR Gyro internal error signalization 13 GND Ground pin 14 GND Ground pin Dimensions A top view of EVB90609-x2 boards is represented in Figure 1. The dimensions of the boards are: 28 mm (length) x 18 mm (height) x 3.5 mm (thickness). Schematics The electrical schematic of the EVB90609-x2 board is presented at Figure 2 as it is based on the typical schematic from MLX90609 datasheet. The value of the capacitor C3 defines the output bandwidth of gyro. The –3dB bandwidth set by C3 is: fOUT =0.16 /(ROUT*C3), with ROUT = 200kΩ (typ.) For instance, with C3=82nF the bandwidth is close to 10Hz. VCC C1 100n R1 10k SLFT1 SLFT2 R2 10k SCLK -SS MISO MOSI ERROR EDGIDC14 NC5 CASE SCLK VDDA SS VSSA MISO VREF U1 MOSI OUTAR MLX90609BA TEST FLT ERROR OUTTEMP SELFTEST HVIN 28 27 26 25 24 23 22 21 NC13 NC14 NC15 NC16 NC17 NC18 NC19 NC20 ERROR VREF OUTAR OUTTMP SLFT1 SLFT2 2 4 6 8 10 12 14 C2 100n VREF C3 82n C5 100n R3 0 OUTAR OUTTMP 13 14 15 16 17 18 19 20 SCLK -SS MISO MOSI VDD GND NC2 TOPCAP4 TOPCAP5 NC31 TESTOUT TESTIN 4 3 2 1 32 31 30 29 VCC 5 6 7 8 9 10 11 12 VCC J1 1 3 5 7 9 11 13 Figure 2. Electrical schematic of the MLX90609 boards 3901190609A Rev 005 Page 2 of 3 May-09 Datasheet EVB90609-x2 Mixed Mode Gyroscope Evaluation Board Component placement and PCB Layout Component placement at the board is presented at Figure 3. Figure 3. Component placement The layouts of the top and bottom side of the board are presented at Figure 4. Figure 4. Board top (blue) and bottom (red) side layout. Revision history Rev.001 from July 2007. Initial release. Rev.002 from January 2008. Figure 2 Figure 3 and Figure 4 were adapted. Text at page 2 was corrected to reflect adapted board. Rev.003 typos, naming conventions, order information Rev.004 typo: R3->R2 Rev.005 typo: 50Hz -> close to 10Hz 3901190609A Rev 005 Page 3 of 3 May-09