Datasheet

Description STM6502, STM6503, STM6504, STM6505
6/29 Doc ID 16101 Rev 6
The STM65xx devices have active-low (optionally active-high) open-drain reset (RST)
output(s) with or without internal pull-up resistor or push-pull as output options, with factory-
programmed or capacitor-adjustable or push-buttons defined output reset pulse duration,
with or without power-on reset function.
Some devices also have an undervoltage monitoring feature: the reset output is also
asserted when the monitored supply voltage V
CC
drops below the specified threshold. The
reset output remains asserted for the reset timeout period (t
REC
) after the monitored supply
voltage goes above the specified threshold.
Figure 1. Logic diagrams
Figure 2. Pin connections
AM00378
V
CC
SR0
RST
V
SS
STM6502
SR1
SR0
SR1
SRC
V
CC
RST
V
SS
STM6503
V
CC
RST
V
SS
STM6504
SR0
SRE
V
CC
BLD
RST
V
SS
STM6505
SR1
SR0
SRC
V
BAT
TSR
TSR
AM00379
SRC
NC NC
1
2
3
STM
6502
4
8
7
6
5
RST
V
SS
V
CC
SR1
SR0
TSR
NC NC
1
2
3
STM
6503
4
8
7
6
5
RST
V
SS
V
CC
SR0
SR1
TSR
NC NC
1
2
3
STM
6504
4
8
7
6
5
RST
V
SS
V
CC
SRE
SR0
BLD
SRC
V
BAT
1
2
3
STM
6505
4
8
7
6
5
RST
V
SS
V
CC
SR1
SR0