STM6502, STM6503
STM6504, STM6505
Dual push-button Smart Reset
TM
with user-adjustable setup delays
Features
■
■
Dual Smart Reset push-button inputs with
extended reset setup delay
Adjustable Smart Reset setup delay (t
SRC
):
by external capacitor or three-state logic
(product options): t
SRC
= 2, 6, 10 s (min.)
Power-on reset
Single RST output, active-low, open-drain
Factory-programmable thresholds to monitor
V
CC
in the range of 1.575 to 4.625 V typ.
Operating voltage 1.0 V (active-low output
valid) to 5.5 V
Low supply current
Operating temperature:
industrial grade –40 °C to +85 °C
TDFN8 package: 2 mm x 2 mm x 0.75 mm
RoHS compliant
TDFN8 (DG)
2 mm x 2 mm
■
■
■
■
■
■
Applications
■
■
■
■
■
■
Mobile phones, smartphones
e-books
MP3 players
Games
Portable navigation devices
Any application that requires delayed reset
push-button(s) response for improved system
stability
■
■
Table 1.
Device summary
Voltage inputs
Smart Reset inputs
t
SRC
programming
Three-
state
input
TSR
RST
BLD
Reset or Power
Good outputs
Package
Part
number
V
CC
V
BAT
SR0
SR1
SRE
Ext.
immediate,
SRC pin
independent
✓
STM6502
(1)
STM6503
STM6504
(1)
STM6505
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
TDFN-8L
TDFN-8L
TDFN-8L
TDFN-8L
✓
1. Contact local ST sales office for availability.
February 2011
Doc ID 16101 Rev 6
1/29
www.st.com
1
Contents
STM6502, STM6503, STM6504, STM6505
Contents
1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1
1.2
Smart Reset devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.2.1
1.2.2
1.2.3
1.2.4
1.2.5
1.2.6
1.2.7
1.2.8
1.2.9
1.2.10
Power supply (V
CC
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Ground (V
SS
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Primary Smart Reset input (SR0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Secondary Smart Reset input (SR1) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Edge-triggered Smart Reset input (SRE pin) – STM6504 only . . . . . . . 11
Adjustable delay of Smart Reset input (SRC pin) – STM6502
and STM6505 only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Programmable Smart Reset input delay (TSR pin) – STM6503
and STM6504 only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Reset output (RST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Battery monitoring input (V
BAT
) – STM6505 only . . . . . . . . . . . . . . . . . 12
Battery low detect output (BLD) – STM6505 only . . . . . . . . . . . . . . . . . 12
2
3
4
5
6
7
8
Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Package marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
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STM6502, STM6503, STM6504, STM6505
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Table 14.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
t
SRC
programmed by an ideal external capacitor – STM6502 and STM6505 . . . . . . . . . . 11
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Operating and measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
V
CC
voltage thresholds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
TDFN – 8-lead 2 x 2 x 0.75 mm, 0.5 mm pitch package mechanical data . . . . . . . . . . . . . 21
Parameter for landing pattern - TDFN – 8-lead 2 x 2 mm package . . . . . . . . . . . . . . . . . . 22
Carrier tape dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Reel dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Package marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
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STM6502, STM6503, STM6504, STM6505
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Logic diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Block diagram - STM6502, STM6503, STM6504 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Block diagram - STM6505 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Single-button Smart Reset typical hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Dual-button Smart Reset typical hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
STM6502, STM6503 timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
STM6504 timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
STM6505 timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Supply current (I
CC
) vs. temperature (STM6505) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Smart Reset delay (t
SRC
) vs. temperature, C
SRC
= 0.62 µF (STM6505) . . . . . . . . . . . . . . 13
Reset threshold (V
RST
) vs. temperature, “S” threshold option, V
CC
falling (STM6505) . . . 14
V
BAT
monitoring threshold (V
BATTH
) vs. temperature, falling (STM6505) . . . . . . . . . . . . . . 14
AC testing input/output waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
TDFN – 8-lead 2 x 2 x 0.75 mm, 0.5 mm pitch package outline . . . . . . . . . . . . . . . . . . . . . 21
Landing pattern - TDFN – 8-lead 2 x 2 mm without thermal pad . . . . . . . . . . . . . . . . . . . . 22
Carrier tape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Reel dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Tape trailer/leader. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Pin 1 orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Package marking, top view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
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STM6502, STM6503, STM6504, STM6505
Description
1
Description
STM6502
has two combined Smart Reset inputs (SR0 and SR1) with delayed Smart Reset
setup time (t
SRC
) programmed by an external capacitor on the SRC pin.
STM6503
is similar to STM6502, has two combined delayed Smart Reset inputs (SR0, SR1)
and three user-selectable delayed Smart Reset setup time (t
SRC
) options of 2 s, 6 s and 10
s through a three-state TSR input 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 the times are minimum).
STM6504
has two independent Smart Reset inputs. SR0 provides the delayed Smart Reset
setup time (t
SRC
) function with three user-selectable t
SRC
options through a three-state TSR
input 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 the times are minimum). SRE provides instant reset. SRE
is edge-triggered with a special debounce time (t
DEBOUNCE
= 240 ms min.) at the falling
edge after a valid reset period.
STM6505
has two combined delayed Smart Reset inputs (SR0, SR1) and provides an
adjustable reset delay setup time via an external capacitor connected to the SRC pin.
The RST output depends also on the V
CC
monitoring threshold. STM6505 also provides
independent low battery detect (BLD) output controlled by the secondary external input
voltage V
BAT
. V
BAT
is monitored for low voltage and provides an indication on the battery low
detect output pin (BLD). V
BAT
threshold is 1.25 V, fixed, and an external resistor divider is to
be used to set the actual battery voltage threshold. V
BAT
threshold hysteresis is 8 mV typ.
(16 mV max.). V
BAT
is voltage monitoring input only, the device is powered only from the
V
CC
pin; V
CC
must be
≥
1.575 V for proper operation of the V
BAT
comparator.
1.1
Smart Reset devices
The Smart Reset device family STM65xx provides a useful feature that ensures inadvertent
short reset push-button closures do not cause system resets. This is done by implementing
extended Smart Reset input delay (t
SRC
). Once the valid Smart Reset input levels and setup
delay are met, the device generates an output reset pulse with user-programmable timeout
period (t
REC
).
The Smart Reset inputs can be also connected to the applications interrupt to allow the
control of both the interrupt pin and the hard reset functions. If the push-buttons are closed
for a short time, the processor is only interrupted. If the system still does not respond
properly, holding the push-buttons for the extended setup time (t
SRC
) causes hard reset of
the processor through the reset outputs. The Smart Reset feature helps significantly
increase system stability.
The STM65xx family of Smart Reset devices consists of low current microprocessor reset
circuits targeted at applications such as MP3 players, navigation, smartphones or mobile
phones; generally any application that requires delayed reset push-button(s) response for
improved system stability. The STM65xx devices feature single or dual Smart Reset inputs
(SR). The delayed Smart Reset setup time (t
SRC
) options of 2 s, 6 s and 10 s (all min.) are
adjustable by an external capacitor on the SRC pin or selectable by three-state logic. The
delayed setup period ignores switch closures shorter than t
SRC
, thus preventing unwanted
resets.
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