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L4988MDTR Datasheet(PDF) 9 Page - STMicroelectronics |
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L4988MDTR Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 32 page L4988 Electrical specifications Doc ID 13617 Rev 6 9/32 Table 6. Reset Pin Symbol Parameter Test condition Min. Typ. Max. Unit Res Vres_l Reset output low voltage Rext = 5k to Vo, Vo > 1V 0.4 V Res IRes_h Reset output high leakage current VRes = 5V 1 µA Res R_p_u Pull up internal resistance With respect to Vo 12 25 50 k Res Vo_th Vo out of regulation threshold Vs = 6 to 31V, Io = 1 to 200mA 6% 8% 10% Below Vo_ref Vcr Vrlth Reset timing low threshold Vs = 13.5V 10% 13% 16% Vo_ref Vcr Vrhth Reset timing high threshold Vs =13.5V 44% 47% 50% Vo_ref Vcr Icr Charge current Vs = 13.5V 8 17.6 30 µA Vcr Idr Discharge current Vs = 13.5V 8 17.6 30 µA Res Trr_2 Reset reaction time(1) 1. When Vo becomes lower than 4V, the reset reaction time decreases down to 2µs assuring a faster reset condition in this particular case. Vo = Vo_th -100mV 100 275 1000 µs Res Trd Reset delay time Vs = 13.5V, Ctr = 1nF 65 150 ms Table 7. Watchdog Pin Symbol Parameter Test condition Min. Typ. Max. Unit Wi Vih Input high voltage Vs = 13.5V 3.5 V Wi Vil Input low voltage Vs = 13.5V 1.5 V Wi Vih Input hysteresis Vs = 13.5V 500 mV Wi Ii Pull down current Vs = 13.5V 10 20 µA Vcw Vwhth High threshold Vs = 13.5V 44% 47% 50% Vo_ref Vcw Vwlth Low threshold Vs = 13.5V 10% 13% 16% Vo_ref Vcw Icwc Charge current Vs = 13.5V, Vcw = 0.1V 48 14 µA Vcw Icwd Discharge current Vs = 13.5V, Vcw = 2.5V 1.0 2.1 4.5 µA Vcw Twop Watchdog period Vs = 13.5V, Ctw = 47nF 25 50 90 ms Res twol Watchdog output low time Vs = 13.5V, Ctw = 47nF 610.5 22 ms |
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