Datasheet A17700 (Allegro) - 8

Pressure Sensor Interface and Signal Conditioning IC A17700 with Polynomial Signal Compensation and Advanced Diagnostics OPERATING CHARACTERISTICS:
Valid over the full supply voltage and ambient temperature ranges, unless otherwise noted
Characteristics Symbol Test Conditions Min. Typ. Max. Unit PWM / SENT OUTPUT
Output Load Resistance RPU Pull-up resistor; output current ≥ –10 mA 1.2 – – kΩ External Load Capacitor CL Open-drain output mode – – 4.7 nF Output Low Saturation Voltage V Output current = –4.7 mA, VCC = 5 V, OUT(Sat)LOW Output FET on – – 0.35 V Output Leakage Current – Output voltage ≤ 5.5 V, output FET off, Open-drain output mode – – 10 µA Output High Saturation Voltage V Output current = 4.7 mA, VCC = 5 V, Output FET OUT(Sat)HIGH Push-pull output mode 4.3 – – V Output Current Limit ILIMIT 18 25 35 mA Pull-Up Voltage VPU – – VCC V Overall Digital Output Accuracy – – 0.3 – %
PWM INTERFACE SPECIFICATIONS
PWM Carrier Frequency f Programmable through EEPROM; PWM See description section 0.25 – 16 kHz PWM PWM Clamp Programming Range CLAMP(H) – – 96 %DC PWMCLAMP(L) 4 – – %DC Noise-free input, f PWM Resolution [1] RES PWM ≤ 2.67 kHz – 12 – bits PWM Noise-free input, fPWM ≤ 16 kHz – 9 – bits Noise-free input, f PWM Output Jitter [1] PWM PWM ≤ 2.67 kHz – 0.025 – %DC JIT Noise-free input, fPWM ≤ 16 kHz – 0.18 – %DC PWM Carrier Frequency Tolerance fPWM-tol –10 – 10 %
SENT INTERFACE SPECIFICATIONS
SENT Tick Time [2] t Programmable through EEPROM; TICK see description section 0.5 – 5 µs SENT Tick Time Tolerance TOLtick –10 – 10 % SENT Message Duration tSENT Tick time = 3 µs – – 1 ms Fast SENT Message Duration t Tick time = 0.5 µs, 3 data nibbles, SCN, and SENTMIN CRC, nibble length = 27 ticks – 96 – µs
INTERNAL TEMPERATURE OUTPUT THROUGH SENT
Internal Temperature Range TSENT-Range 12-bit digital temperature –256 – 255 °C Internal Temperature Resolution TSENT-step Internal temperature sensor output digital step – 0.125 – °C [1] Guaranteed by design. Not tested in production. [2] See Table 6 in Functional Description section for details. 8 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Document Outline Features and Benefits Description Package Functional Block Diagram Selection Guide Absolute Maximum Ratings Thermal Characteristics Pinout Diagram and Terminal List Operating Characteristics Functional Description Bandwidth Selection Output Response Time Power-On Time Front End Gain Adjustment Front End Differential Offset Adjustment Input Signal Range Calculation Fine Adjustment and Temperature Compensation Output Protocols Digital Output Mode Selection Digital Output Driver Fall Time Selection Broken Wire Detection Diagnostic Features Programming: Manchester Communication Entering Manchester Coding Manchester Interface Message Structure CRC Device Access Shadow Registers Device EEPROM and Register Access Lock EEPROM Map Volatile Registers Map Power Derating Package Outline Drawing