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KMA199E Datasheet(PDF) 21 Page - NXP Semiconductors |
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KMA199E Datasheet(HTML) 21 Page - NXP Semiconductors |
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21 / 31 page  KMA199E_1 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 01 — 18 October 2007 21 of 31 NXP Semiconductors KMA199E Programmable angle sensor 13.5.2 EEPROM registers The device includes several internal registers, which are used for purposes, such as customization and identification. The initial signature allows read access to all areas, but write access just to customer registers only. Write accesses to reserved areas are ignored. Since these registers are implemented as EEPROM cells, writing to the registers needs a specific time tprog after each write access. Since there is no check for the programming time, the user has to take care that no other access to the EEPROM is done during the programming. The EEPROM must not be addressed during the time tprog. Note: Before data can be stored in the EEPROM, the internal charge pump has to be switched on for the duration of programming by setting register CTRL1, bit 11 EEP_CP_CLOCK_EN, as well as register TESTCTRL0, bit 11 EEP_WRITE_EN. For calculating the checksum, all register addresses have to be read out and consulted, although some of them are reserved for calibration purposes. Table 17. EEPROM registers Address Command write/read Register Bit Description Default MSB/LSB 0h 00h/01h reserved - addresses are reserved for calibration purposes Note: These addresses have to be read out for calculating the checksum. The content stored in these registers may not be changed! [1] 1h 02h/03h 2h 04h/05h 3h 06h/07h 4h 08h/09h 5h 0Ah/0Bh 6h 0Ch/0Dh 7h 0Eh/0Fh ZERO_ANGLE 15 to 0 mechanical zero degree position 00h/00h 8h 10h/11h MAGNET_LOST 15 to 0 magnet-lost detection 0000h — disabled 004Fh — enabled 00h/00h 9h 12h/13h ANG_RNG_MULT_LSB 15 to 3 least significant bits of angular range multiplicator 20h/00h 2 to 0 undefined[2] Ah 14h/15h CLAMP_LO 15 to 13 undefined[2] 01h/00h 12 to 0 lower clamping level output voltage Bh 16h/17h CLAMP_HI 15 to 13 undefined[2] 12h/FFh 12 to 0 upper clamping level output voltage Ch 18h/19h ID_LO 15 to 0 lower 16 bits of identification code 00h/00h Dh 1Ah/1Bh ID_HI 15 to 0 upper 16 bits of identification code 00h/00h Eh 1Ch/1Dh CLAMP_SW_ANGLE 15 to 6 when angle is bigger than CLAMP_SW_ANGLE the output will switch to CLAMP_LO for a positive slope FFh/C1h ANG_RNG_MULT_MSB 5 to 0 most significant bits of angular range multiplicator |
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