ST STM6522 User Manual
Smart Reset™ with capacitor-adjustable setup delay
Features
■ Dual Smart Reset™ push-button inputs with
capacitor-adjustable extended reset setup
delay (t
■ No power-on reset
■ Dual RST output, active-low, open-drain
■ Fixed Smart Reset™ input logic voltage levels
■ Broad operating voltage range 1.65 V to 5.5 V,
inactive reset output levels valid down to 1.0 V
■ Low supply current (1.5 µA)
■ Operating temperature:
industrial grade –40 °C to +85 °C
■ TDFN8 package: 2 mm x 2 mm x 0.75 mm
■ RoHS compliant
SRC
)
STM6522
Dual push-button
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
January 2012 Doc ID 17045 Rev 3 1/25
www.st.com
1
Contents STM6522
Contents
1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Power supply (VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 Ground (V
2.3 Primary Smart Reset™ input (SR0
2.4 Secondary Smart Reset™ input (SR1
2.5 Adjustable delay of Smart Reset™ (SRC pin) . . . . . . . . . . . . . . . . . . . . . 10
2.6 Reset output (RST1
2.7 Reset output (RST2
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
SS
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
) . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7 Package footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8 Tape and reel information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
10 Package marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2/25 Doc ID 17045 Rev 3
STM6522 List of tables
List of tables
Table 1. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 2. t
Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 4. Operating and measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 5. DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 6. TDFN – 8-lead 2 x 2 x 0.75 mm, 0.5 mm pitch package mechanical data . . . . . . . . . . . . . 17
Table 7. Parameters for landing pattern - TDFN – 8-lead 2 x 2 mm package . . . . . . . . . . . . . . . . . 18
Table 8. Carrier tape dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 9. Reel dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 10. Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 11. Package marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 12. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
programmed by an ideal external capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SRC
Doc ID 17045 Rev 3 3/25
List of figures STM6522
List of figures
Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 4. Single-button Smart Reset™ typical hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 5. Dual-button Smart Reset™ typical hookup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 6. Timing waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 7. STM6522 timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 8. Supply current (I
Figure 9. Smart Reset delay (t
Figure 10. Reset timeout period (t
Figure 11. Smart Reset™ input voltage threshold vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 12. AC testing input/output waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 13. TDFN – 8-lead 2 x 2 x 0.75 mm, 0.5 mm pitch package outline. . . . . . . . . . . . . . . . . . . . . 17
Figure 14. Landing pattern - TDFN – 8-lead 2 x 2 mm without thermal pad . . . . . . . . . . . . . . . . . . . . 18
Figure 15. Carrier tape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 16. Reel dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 17. Tape trailer/leader. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 18. Pin 1 orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 19. Package marking, top view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
) vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
CC
) vs. temperature, C
SRC
) vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
REC
= 0.6 µF. . . . . . . . . . . . . . . . . . . . . . . . . 11
SRC
4/25 Doc ID 17045 Rev 3
STM6522 Description
1 Description
The Smart Reset™ devices provide a useful feature that ensures that inadvertent short
reset push-button closures do not cause system resets as the extended Smart Reset™
delay setup periods are implemented. Once the valid Smart Reset™ input levels and setup
delay are met, the device generates an output reset pulse for a fixed timeout period (t
The typical application hookup shows that either a single Smart Reset™ input, or both reset
inputs can be connected to the applications interrupt and control both the interrupt pin and
the hard reset functions. If the push-button is closed for a short time, the processor is only
interrupted. If the system still does not respond properly, holding the push-button(s) for the
extended setup time (t
) causes a hard reset of the processor. The Smart Reset™
SRC
feature helps significantly increase system stability and eliminates the need for a dedicated
reset button.
The STM65xx family of Smart Reset™ devices consists of low-current microprocessor reset
circuits targeted at applications such as MP3 players, portable navigation or mobile phones,
generally any application that requires delayed reset push-button(s) response for improved
system stability. The devices in the STM65xx Smart Reset™ family include various
combinations of useful features for the targeted applications.
REC
).
The STM6522 has two combined Smart Reset™ inputs (SR0
setup time (t
) programmed by an external capacitor on the SRC pin.
SRC
Figure 1. Logic diagram
V
CC
SR0
RST1
RST2
SR1
SRC
STM6522
V
SS
and SR1) with delayed reset
AM04867v2
Doc ID 17045 Rev 3 5/25
Description STM6522
Table 1. Signal names
Symbol
RST1
RST2
SR0
Input/
output
Description
Output Open-drain reset output, active-low, no internal pull-up resistor.
Output Open-drain reset output, active-low, no internal pull-up resistor.
Input
Primary push-button Smart Reset™ input, active-low, fixed voltage input logic
levels, no internal pull-up.
Secondary push-button Smart Reset™ input - combines with the primary push-
SR1
Input
button reset to provide setup delay time, active-low, fixed voltage input logic
levels, no internal pull-up.
SRC Input
V
V
Supply
CC
Supply Supply ground.
SS
Smart Reset™ input delay setup control: connect to an external capacitor to
adjust the delay setup time (t
SRC
).
Supply voltage input. Power supply for the device. A 0.1 µF decoupling ceramic
capacitor is recommended to be connected between V
NC No connect (not bonded); should be connected to V
Figure 2. Pin connections
V
SS
SR1
RST1
1
2
STM6522
3
4
8
V
CC
SR0
7
NC
6
5
SRC
RST2
and VSS pins.
CC
.
SS
AM04868v2
Figure 3. Block diagram
SR1
generator
SR0
SRC
6/25 Doc ID 17045 Rev 3
t
SRC
t
REC
generator
RST1
RST2
AM04869v2
STM6522 Description
Figure 4. Single-button Smart Reset™ typical hookup
V
CC
V
CC
RST1
SRC
C
SRC
STM6522
SR1
SR0
V
SS
Figure 5. Dual-button Smart Reset™ typical hookup
V
CC
V
RESET
CC
MCU
INT/
NMI
V
SS
PUSH-BUTTON
SWITCH
AM04870v2
V
CC
STM6522
V
SS
RST1
SRC
SR1
SR0
C
SRC
PUSH-BUTTON
SWITCH
RESET
INT/
NMI
PUSH-BUTTON
SWITCH
V
CC
MCU
V
SS
AM004871v2
Doc ID 17045 Rev 3 7/25
Description STM6522
Figure 6. Timing waveforms
V
CC
SR0
SR1
RST1,
RST2
1.65 V
Glitch
immunity
t
SRC
t
REC
1.65 V
AM04872v2
8/25 Doc ID 17045 Rev 3
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