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AS1926-BSTT-D07 Datasheet(PDF) 7 Page - ams AG |
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AS1926-BSTT-D07 Datasheet(HTML) 7 Page - ams AG |
7 / 12 page www.austriamicrosystems.com Revision 1.00 7 - 12 AS1925/AS1926 Data Sheet - D e t a i l e d D e s c r i p t i o n 8 Detailed Description Reset Output The AS1925/AS1926 assert a reset during power-up, power-down, and brownout conditions if the VCC supply voltage falls below a preset threshold (AS1925/AS1926). The reset remains asserted for a fixed timeout delay (see page 4) once VCC has stabilized. The devices are available with four timeout options: 1.5ms, 30ms, 210ms, and 1.68s. The AS1925/AS1926 have two reset outputs (RESETN and RESET); RESETN is the inverse of RESET. The AS1925 has an active-high push/pull output and an active-low push/pull output. The AS1926 has an active-high push/pull out- put and an active-low open-drain output. Manual Reset Input The devices feature a manual reset input (MRN). When pin MRN is pulled low, a reset is asserted and the reset remains asserted as long as MRN is kept low, and for a fixed timeout delay after MRN goes high. MRN is connected to an internal 20k Ω pullup resistor, thus this pin can be left open if it is not used. MRN can be driven with CMOS logic-level or with open-drain/collector outputs. To create a manual reset circuit, connect a normally open momentary switch from MRN to ground (see Figure 9 on page 8). External debounce circuitry is not required. If pin MRN is driven via long cables or the device is used in a noisy environment, a 0.1µF capacitor from MRN to ground will provide additional noise immunity. |
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