A19350 High Accuracy GMR Wheel Speed and Direction Sensor IC
The A19350 is a giant magnetoresistance (GMR) integrated circuit (IC) providing a user-friendly two-wire solution for applications requiring speed and direction information. It features high sensitivity GMR sensor elements and high precision BiCMOS circuits for accurate, low magnetic field operation. The integrated capacitor enhances EMC robustness, while the SolidSpeed Digital Architecture ensures performance under extreme system-level disturbances, including vibration immunity. This IC offers flexible orientation for xMR or Hall replacement and achieves an ASIL B(D) rating through integrated diagnostics and a certified safety design process. Its two-wire current source output pulse-width protocol supports speed, direction, and ASIL, with an integrated EEPROM for device traceability.
Product Attributes
- Brand: Allegro MicroSystems
- Certifications: ASIL B(D)
- Package: 2-Pin SIP (UB)
- Material: Silicon integrated circuit, overmolded package, tin leadframe plating (Pb-free)
Technical Specifications
| Characteristic | Symbol | Test Conditions | Min. | Typ. | Max. | Unit |
| ABSOLUTE MAXIMUM RATINGS | ||||||
| Supply Voltage | VCC | Refer to Power Derating section | 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 | 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 | 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) | 306 | 360 | 414 | 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 | BSEQ(n+1) / BSEQ(n) | Signal period-to-period variation (refer to Figure 3) | 60 | 200 | % | |
| Overall signal variation (e.g. run-out) | BSEQ(n+i) / BSEQ(n) | (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, 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-RBE-A_C19761957.pdf
Please Use Our Online Inquiry Contact Form Below If You Have Any Questions, Our Team Will Get Back To You As Soon As Possible
