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MAXQ7667 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAXQ7667 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 40 page 16-Bit, RISC, Microcontroller-Based, Ultrasonic Distance-Measuring System 8 _______________________________________________________________________________________ Note 1: Noise measured at bandpass filter output with ECHO+ and ECHO- shorted divided by the gain with fBPF = 50kHz. Note 2: Gain adjust resolution typically ranges between 6.25% and 12.5%. Note 3: LIN 2.0 specifies a maximim data rate of 20kbps. Higher data rates could be possible with compatible devices and suitable line conditions. ELECTRICAL CHARACTERISTICS (continued) (VDVDDIO = +5V, VAVDD = +3.3V; VDVDD = +2.5V, system clock (fSYSCLK) = 16MHz, burst frequency (fBURST) = bandpass frequency (fBPF) = 50kHz, CREFBG = CREF = 1µF in parallel with 0.01µF, fADCCLK = 2MHz (SAR data rate = 125ksps), TA = TMIN to TMAX, unless otherwise specified. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SPI INTERFACE TIMING (Figures 11 and 12) SPI Master Operating Frequency 1/tMCK 0.5 x fSYSCLK 8 MHz SPI Slave Operating Frequency 1/tSCK 0.25 x fSYSCLK 4 MHz SCLK Output Pulse-Width High/Low tMCH, tMCL tMCK/2 - 25 ns MOSI Output Hold Time After SCLK Sample Edge tMOH tMCK/2 - 25 ns MOSI Output Valid to Sample Edge tMOV tMCK/2 - 25 ns MISO Input Valid to SCLK Sample Edge tMIS 25 ns MISO Input Hold Time After SCLK Sample Edge tMIH 0ns SCLK Inactive to MOSI Inactive tMLH 0ns SCLK Input Pulse-Width High/Low tSCH, tSCL tSCK/2 ns SS Active to First Shift Edge tSSE 4tSYSCLK ns MOSI Input Setup Time to SCLK Sample Edge tSIS 25 ns MOSI Input Hold Time After SCLK Sample Edge tSIH 25 ns MISO Output Valid After SCLK Shift Edge Transition tSOV 50 ns SS Inactive Duration tSSH tSYSCLK + 25 ns SCLK Inactive to SS Rising Edge tSD tSYSCLK + 25 ns FLASH PROGRAMMING Mass erase 200 Flash Erase Time Page erase (512 bytes per page) 20 ms Flash Programming Time 20µs per word 657 ms Write/Erase Cycles 10,000 Cycles Data Retention Average temperature = +85°C 15 Years |
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