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STM805 Datasheet(PDF) 4 Page - STMicroelectronics |
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STM805 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 32 page STM690/704/795/802/804/805/806 4/32 SUMMARY DESCRIPTION The STM690/704/795/802/804/805/806 Supervi- sors are self-contained devices which provide mi- croprocessor supervisory functions with the ability to non-volatize and write-protect external LPSRAM. A precision voltage reference and com- parator monitors the VCC input for an out-of-toler- ance condition. When an invalid VCC condition occurs, the reset output (RST) is forced low (or high in the case of RST). These devices also offer a watchdog timer (except for STM704/795/806) as well as a power-fail comparator (except for STM795) to provide the system with an early warning of impending power failure. These devices are available in a standard 8-pin SOIC package or a space-saving 8-pin TSSOP package. Figure 2. Logic Diagram (STM690/802/804/805) Note: 1. For STM804/805, reset output is active-high and open drain. Figure 3. Logic Diagram (STM704/806) Figure 4. Logic Diagram (STM795) Table 2. Signal Names Note: 1. Open drain for STM804/805 only. 2. STM795 AI08846 VCC VBAT STM690/ 802/804/ 805 VSS VOUT RST(RST)(1) WDI PFI PFO AI08847 VCC VBAT STM704 STM806 VSS VOUT RST MR PFI PFO MR Push-button Reset Input WDI Watchdog Input RST Active-Low Reset Output RST(1) Active-High Reset Output E(2) Chip Enable Input ECON (2) Conditioned Chip Enable Output Vccsw(2) VCC Switch Output VOUT Supply Voltage Output VCC Supply Voltage VBAT Back-up Supply Voltage PFI Power-fail Input PFO Power-fail Output VSS Ground AI08848 VCC VBAT STM795 VSS VOUT RST VCCSW E ECON |
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