STM6513 Datasheet, PDF (8/29 Pages) STMicroelectronics – Dual push-button Smart ResetTM with dual reset outputs and user-selectable setup delay

Pin descriptions
3
Pin descriptions
STM6513
3.1
Power supply (V_CC)
This pin is used to provide the power to the Smart Reset device and to monitor the power
supply. A 0.1 µF decoupling ceramic capacitor is recommended to be connected between
V_CC and V_SS pins.
3.2
Ground (V_SS)
This is the ground for the device and all supplies.
3.3
Smart Reset inputs (SR0, SR1)
Push-button Smart Reset inputs. Both inputs need to be held active at the same time for at
least t_SRC to activate the reset outputs. When only one Smart Reset input is used, connect
the unused one permanently to V_SS.
3.4
User-programmable Smart Reset delay (TSR pin)
Used to allow the user to program the setup time before the push-buttons action is validated
by reset output. Controlled by different voltage levels on the TSR pin: when connected to
ground, t_SRC = 2 s; when left open, t_SRC = 6 s; when connected to V_CC, t_SRC = 10 s
(all times are minimum). TSR is a DC-type input, intended to be either permanently
grounded, permanently connected to V_CC or permanently left open. If left open, for improved
system glitch immunity it is strongly recommended to connect a 0.1 µF decoupling ceramic
capacitor between the TSR and V_SS pins.
3.5
Reset outputs (RST1, RST2)
Reset outputs, RST1 active-high, push-pull type, RST2 active-low, open-drain.
3.6
Adjustable output reset timeout period input pin (TREC_ADJ)
The output reset timeout period (t_REC1) on RST1 is adjustable by connecting an external
capacitor C_tREC to the TREC_ADJ pin. Calculated t_REC and C_tREC examples are given in
Table 2. Refer also to Table 5.
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Doc ID 16490 Rev 2