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DRV401AIDWP 数据表(PDF) 21 Page - Texas Instruments |
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DRV401AIDWP 数据表(HTML) 21 Page - Texas Instruments |
21 / 36 page DRV401 SBVS070B − JUNE 2006 − REVISED MAY 2009 www.ti.com 21 ERROR CONDITIONS In addition to the Over-Range flag that indicates signal clipping in the output amplifier (differential amplifier), a system error flag is provided. The ERROR flag indicates conditions when the output voltage does not represent the primary current. It is active during a demagnetization cycle, during a power-fail or brown-out. It also goes active with an open or short-circuit in the probe loop. As soon as the error condition is no longer present and the circuit has returned to normal operation, the flag resets. Both the ERROR and Over-Range flags are open-drain logic outputs. They can be connected together for a wired-OR and require an external pull-up resistor for proper operation. The following conditions result in ERROR flag activation (ERROR asserts low): 1. The probe comparator stays low for more than 32 µs. This condition occurs either if the probe coil connection is open or if the supply voltage dips to the level where the required saturation current cannot be reached. During the 32 µs timeout, the ICOMP driver remains active but goes inactive thereafter. In case of recovery, ERROR is low and the ICOMP driver remains in reset for another 3.3ms. 2. The probe driver pulse-width is less than 280ns for three consecutive periods. This condition indicates either a shorted field probe coil or a fully-saturated sensor at start-up. If this condition persists longer than 25 µs and then recovers, the ERROR flag remains low and ICOMP is in reset for another 3.3ms. If the condition lasts less than 25 µs, the ERROR flag recovers immediately and the ICOMP driver is not interrupted. 3. During demagnetization, if the cycle is aborted early by pulling DEMAG low, the ERROR flag stays low for another 3.3ms (ICOMP is disabled during this time). 4. An open compensation coil is detected (longer than 100 µs). Note: the probe driver, the PWM signal filter and the ICOMP driver continue to function in normal mode—only the ERROR flag is asserted in this case. This condition indicates that not enough current is flowing in the ICOMP driver output; this condition might be the result of a high-resistance compensation coil or the connection of an external driver. Detection of this condition can be disabled by setting the CCdiag pin low. 5. At power-on after VDD1 crosses the +4V threshold, the ERROR flag is low for approximately 42 µs. 6. A supply voltage low (brown-out) condition lasts longer than 100 µs. Recovery is the same as power-up, either with or without a demag cycle. PROTECTION RECOMMENDATIONS The inputs IAIN1 and IAIN2 require external protection to limit the voltage swing beyond 10V of the supply voltage. The driver outputs ICOMP1 and ICOMP2 can handle high current pulses protected by internal clamp circuits to the supply voltage. If repeated over-currents of large magnitudes are expected, connect external Schottky diodes to the supply rails. This external protection prevents current flowing into the die. The probe connections IS1 and IS2 are protected with diode clamps to the supply rails. In normal applications, no external protection is required. The maximum current must be limited to ±75mA. All other pins offer standard protection—see the Absolute Maximum Ratings table. |
类似零件编号 - DRV401AIDWP |
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类似说明 - DRV401AIDWP |
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