Product Overview
The A19250 is a high-accuracy Giant Magnetoresistance (GMR) Wheel Speed Sensor IC designed for applications requiring precise speed information. It integrates GMR sensor elements and BiCMOS circuits on a single chip, offering high accuracy and low magnetic field operation. The device features a two-wire current source output, supporting speed and ASIL compliance. Its SolidSpeed Digital Architecture ensures accurate edge performance even under extreme system disturbances. The A19250 is compatible with Hall effect sensor replacement and includes integrated diagnostics for ASIL B(D) rating. An integrated capacitor enhances EMC robustness, and an EEPROM provides device traceability.
Product Attributes
- Brand: Allegro MicroSystems
- Technology: Giant Magnetoresistance (GMR)
- Package: 2-Pin SIP (UB)
- Certifications: ASIL B(D)
- Output: Two-wire current source
- Material: Lead (Pb) free, tin leadframe plating
- Origin: U.S.A.
Technical Specifications
| Characteristic | Symbol | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| ABSOLUTE MAXIMUM RATINGS | ||||||
| Supply Voltage | VCC | Refer to Power Derating section; potential between pin 1 and pin 2 | 28 | V | ||
| Reverse Supply Voltage | VRCC | 18 | V | |||
| Operating Ambient Temperature | TA | 40 | 150 | C | ||
| Maximum Junction Temperature | TJ(max) | 165 | C | |||
| Storage Temperature | Tstg | 65 | 170 | C | ||
| Applied Magnetic Flux Density | B | In any direction; no permanent damage; functionality not guaranteed | 630 | G | ||
| INTERNAL DISCRETE CAPACITOR RATINGS | ||||||
| Nominal Capacitance | CSUPPLY | Connected between pin 1 and pin 2 (see Figure 2) | 2.2 | nF | ||
| ELECTRICAL CHARACTERISTICS | ||||||
| Supply Voltage | VCC | Potential between pin 1 and pin 2 | 4.25 | 24 | V | |
| Reverse Supply Current | IRCC | VCC = 18 V | 10 | mA | ||
| Supply Zener Clamp Voltage | VZsupply | ICC = ICC(MAX) + 3 mA, TA = 25C | 28 | V | ||
| Undervoltage Lockout Turn-off level | VCC(OFF) | 3.5 | V | |||
| Undervoltage Lockout Turn-on level | VCC(ON) | 3.75 | 4.25 | V | ||
| Supply Current (Low-current state) | ICC(LOW) | 5.9 | 8.4 | mA | ||
| Supply Current (High-current state) | ICC(HIGH) | 12 | 16 | mA | ||
| Supply Current Ratio | ICC(HIGH) / ICC(LOW) | Measured as a ratio of high current to low current (isothermal) | 1.9 | |||
| ASIL Safety Current (VCC > VCC(OFF)) | IRESET | 1.5 | 2.2 | 3.9 | mA | |
| ASIL Safety Current (VCC < VCC(OFF)) | IRESET | 0 | 3.9 | mA | ||
| Output Rise/Fall Time | tr, tf | VCC = 5 V | 0 | 1.5 | s | |
| POWER-ON CHARACTERISTICS | ||||||
| Power-On State | POS | VCC > VCC(min) | ICC(LOW) mA | |||
| Power-On Time | tPO | VCC > VCC(min) | 1 | ms | ||
| OUTPUT PROTOCOLS | ||||||
| Speed | ||||||
| ASIL Safety Current Time (Error Protocol 1) | tRESET(EP1) | See Figure 9 | 145 | 215 | s | |
| ASIL Safety Current Time (Error Protocol 2) | tRESET(EP2) | See Figure 9 | 4 | 7.5 | ms | |
| INPUT CHARACTERISTICS AND PERFORMANCE | ||||||
| Operating Frequency | fIN | Corresponds to wheel speed multiplied by number of target pole-pairs | 0 | 5000 | Hz | |
| Operating Differential Magnetic Input (peak-to-peak) | BDIFF(pk-pk) | See Figure 4 | 2.5 | G | ||
| Operating Differential Magnetic Range | BDIFF | See Figure 4 | 900 | 900 | G | |
| Operating Differential Magnetic Offset | BDIFFEXT | Differential magnetic offset; see Figure 4 | 40 | 40 | G | |
| Allowable Differential Sequential Signal Variation | BSEQ(n+1) / BSEQ(n) | Signal period-to-period variation (see Figure 3) | 60 | 200 | % | |
| Operate Point | BOP | % of peak-to-peak IC-processed signal | 60 | % | ||
| Release Point | BRP | % of peak-to-peak IC-processed signal | 40 | % | ||
| Repeatability (Jitter) | ErrE | Constant air gap, temperature, and target speed. Sinusoidal input signal. Greater than 1000 output edges captured. | 0.3 | % | ||
| Calibration Period | NCAL | Number of Cycles after rotation until to first accurate edge (See Figure 5 for TCYCLE Definition) | 0.75 TCYCLE | 1.00 TCYCLE | 1.25 TCYCLE | |
| THERMAL CHARACTERISTICS | ||||||
| Magnetic Temperature Coefficient | TC | Valid for full temperature range based on ferrite | 0.2 | %/C | ||
| Package Thermal Resistance | RJA | Single-layer PCB with copper limited to solder pads | 213 | C/W | ||
2401220948_ALLEGRO-A19250LUBATN-A_C19761433.pdf
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