Product Overview
The A19350 is a high-accuracy Giant Magnetoresistance (GMR) integrated circuit (IC) designed for wheel speed and direction sensing applications. It offers a user-friendly two-wire current source output pulse-width protocol, providing speed, direction, and ASIL information. The IC features GMR technology for high sensitivity and precision BiCMOS circuits for accuracy, operating effectively in low magnetic fields. Its integrated capacitor enhances EMC robustness, while the SolidSpeed Digital Architecture ensures performance stability even under extreme system-level disturbances, including vibration. The A19350 can replace xMR or Hall sensors with flexible orientation and boasts an ASIL B(D) rating due to integrated diagnostics and a certified safety design process. An integrated EEPROM provides device traceability throughout production.
Product Attributes
- Brand: Allegro MicroSystems
- Certifications: ASIL B(D) rating
- Package: 2-Pin SIP (UB)
- Material: Lead (Pb) free, tin leadframe plating
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 | 500 | G | ||
| INTERNAL DISCRETE CAPACITOR RATINGS | ||||||
| Nominal Capacitance | CSUPPLY | Connected between pin 1 and pin 2 (refer to Figure 2) | 2.2 | nF | ||
| ELECTRICAL CHARACTERISTICS | ||||||
| Supply Voltage | VCC | Potential between pin 1 and pin 2 | 4 | 24 | V | |
| Reverse Supply Current | IRCC | VCC = VRCC(MAX) | 10 | mA | ||
| Supply Zener Clamp Voltage | VZsupply | ICC = ICC(MAX) + 3 mA, TA = 25C | 28 | 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 | IRESET | Refer to Figure 11 | 1.5 | 3.5 | 3.9 | mA |
| ASIL Safety Current Time (Error Protocol 1) | tRESET(EP1) | Refer to Figure 11 | 90 | s | ||
| ASIL Safety Current Time (Error Protocol 2) | tRESET(EP2) | Refer to Figure 11 | 3 | 6 | ms | |
| Output Rise/Fall Time | tr, tf | Voltage measured at terminal 2 in Figure 2; RL = 100 , CL = 10 pF, measured between 10% and 90% of signal | 2 | 4 | s | |
| POWER-ON CHARACTERISTICS | ||||||
| Power-On State | POS | VCC > VCC(min) as connected in Figure 1 | ICC(LOW) | mA | ||
| Power-On Time | tPO | VCC > VCC(min) as connected in Figure 1 | 1 | ms | ||
| OUTPUT PULSE-WIDTH PROTOCOL | ||||||
| Pulse-Width Off Time | tW(PRE) | 38 | 45 | 52 | s | |
| Forward Pulse Width | tW(FWD) | 76 | 90 | 104 | s | |
| Reverse Pulse Width | tW(REV) | 153 | 180 | 207 | s | |
| Warning Pulse Width (-xxE variant) | tW(WARN) | 38 | 45 | 52 | s | |
| Standstill Pulse Width (-xxE variant) | tW(STILL) | 1232 | 1440 | 1656 | s | |
| Standstill Period (-xxE variant) | tSTOP | 590 | 737 | 848 | ms | |
| Non-Direction Pulse Width (-xxE variant) | tW(ND) | 306 | 360 | 414 | s | |
| INPUT CHARACTERISTICS AND PERFORMANCE | ||||||
| Operating Frequency, Forward Rotation | fFWD | 0 | 3.9 | kHz | ||
| Operating Frequency, Reverse Rotation | fREV | 0 | 2.4 | kHz | ||
| Operating Frequency, Warning Pulses | fWARN | 0 | 6.4 | kHz | ||
| Operating Differential Magnetic Input (peak-to-peak) | BDIFF(pk-pk) | Refer to Figure 6 | 5 | G | ||
| Peak-to-peak allowable for repeatability | Refer to Figure 6 | 20 | G | |||
| Operating Differential Magnetic Range | BDIFF | Refer to Figure 6 | 300 | 300 | G | |
| Operating Differential Magnetic Offset | BDIFFEXT | See Figure 6 | 40 | 40 | G | |
| Operating Single-Ended Bx Field Magnitude | Bx | Refer to Figure 7 for field orientations | 50 | 50 | G | |
| Allowable Differential Sequential Signal Variation (period-to-period) | BSEQ(n+1) / BSEQ(n) | Refer to Figure 3 | 60 | 200 | % | |
| Allowable Differential Sequential Signal Variation (overall) | BSEQ(n+i) / BSEQ(n) | (e.g. run-out) (refer to Figure 3) | 40 | 200 | % | |
| Operate Point | BOP | % of peak-to-peak IC-processed signal | 60 | % | ||
| Release Point | BRP | % of peak-to-peak IC-processed signal | 40 | % | ||
| Air Gap Warning Level | BWARN | Warning pulses output when BDIFF(pk-pk) < BWARN | 10 | Gpk-pk | ||
| Repeatability (jitter) | ErrE | Constant air gap (> 20 G(pk-pk)), temperature, and target speed. Sinusoidal input signal. Greater than 1000 output edges captured. | 0.3 | % | ||
| Target Pitch | TPITCH | Arc length of each pole-pair (at 0 mm air gap) | 1.4 | 8 | mm | |
| Switch Point Separation | BDIFF(SP-SEP) | Required amount of amplitude separated between channels at each BOP and BRP occurrence. (refer to Figure 5) | 20 | %pk-pk | ||
| 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 | ||
2401220953_ALLEGRO-A19350LUBATN-FBE-A_C19761956.pdf
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