Datasheet A3955 (Allegro) - 5

A3955 Full-Bridge PWM Microstepping Motor Driver ELECTRICAL CHARACTERISTICS (continued) at TA = 25°C, VBB = 5 V to 50 V, VCC = 4.5 V to 5.5 V (unless otherwise noted. ) Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Control Circuitry
Logic Supply Voltage Range VCC Operating 4.5 5.0 5.5 V Reference Voltage Range VREF Operating 0.5 — 2.5 V UVLO Enable Threshold VCC = 0 →5 V 3.35 3.70 4.05 V UVLO Hysteresis 0.30 0.45 0.60 V Logic Supply Current ICC(ON) — 42 50 mA ICC(OFF) D0 = D1 = D2 = 0.8 V — 12 16 mA Logic Input Voltage VIN(1) 2.0 — — V VIN(0) — — 0.8 V Logic Input Current IIN(1) VIN = 2.0 V — <1.0 20 μA IIN(0) VIN = 0.8 V — <-2.0 -200 μA Mixed-Decay Comparator VPFD Slow Current-Decay Mode 3.5 — — V Trip Points Mixed Current-Decay Mode 1.1 — 3.1 V Fast Current-Decay Mode — — 0.8 V Mixed-Decay Comparator VIO(PFD) — 0 ±20 mV Input Offset Voltage Mixed-Decay Comparator ∆VIO(PFD) 5.0 25 55 mV Hysteresis Reference Input Current IREF VREF = 0 V to 2.5 V — — ±5.0 μA Reference Divider Ratio VREF/VS at trip, D0 = D1 = D2 = 2 V — 3.0 — — Digital-to-Analog Converter — 1.0 V < VREF 2.5 V — — ±3.0 % Accuracy* 0.5 V < VREF 1.0 V — — ±4.0 % Current-Sense Comparator VIO(S) VREF = 0 V — — ±5.0 mV Input Offset Voltage* Step Reference SRCR D0 = D1 = D2 = 0.8 V — 0 — % Current Ratio D0 = 2 V, D1 = D2 = 0.8 V — 19.5 — % D0 = 0.8 V, D1 = 2 V, D2 = 0.8 V — 38.2 — % D0 = D1 = 2 V, D2 = 0.8 V — 55.5 — % D0 = D1 = 0.8 V, D2 = 2 V — 70.7 — % D0 = 2 V, D1 = 0.8 V, D2 = 2 V — 83.1 — % D0 = 0.8 V, D1 = D2 = 2 V — 92.4 — % D0 = D1 = D2 = 2 V — 100 — % Continued next page… * The total error for the VREF/VS function is the sum of the D/A error and the current-sense comparator input offset voltage. Allegro MicroSystems, Inc. 4 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com