STM6522 Dual push-button Smart Reset™ with capacitor-adjustable setup delay Features ■ Dual Smart Reset™ push-button inputs with capacitor-adjustable extended reset setup delay (tSRC) ■ 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.
Contents STM6522 Contents 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.1 Power supply (VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2 Ground (VSS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.
STM6522 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. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 tSRC programmed by an ideal external capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of figures STM6522 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. 4/25 Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STM6522 1 Description 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 (tREC).
Description STM6522 Table 1. Signal names Symbol Input/ output RST1 Output Open-drain reset output, active-low, no internal pull-up resistor. RST2 Output Open-drain reset output, active-low, no internal pull-up resistor. SR0 Input Primary push-button Smart Reset™ input, active-low, fixed voltage input logic levels, no internal pull-up.
STM6522 Description Figure 4. Single-button Smart Reset™ typical hookup VCC VCC RESET RST1 SRC STM6522 CSRC VCC MCU SR1 INT/ NMI SR0 VSS VSS PUSH-BUTTON SWITCH AM04870v2 Figure 5.
Description STM6522 Figure 6. Timing waveforms 1.65 V 1.
STM6522 Pin descriptions 2 Pin descriptions 2.1 Power supply (VCC) This pin is used to provide the power to the device. A 0.1 µF decoupling ceramic capacitor is recommended to be connected between VCC and VSS pins. 2.2 Ground (VSS) This is the supply ground for the device. 2.3 Primary Smart Reset™ input (SR0) The primary push-button Smart Reset™ input, active-low pin is connected to the pushbutton switch.
Pin descriptions 2.5 STM6522 Adjustable delay of Smart Reset™ (SRC pin) This pin controls the setup time before the push-button action is validated by the reset output. It is connected to an external capacitor (CSRC), which is tied to ground to provide the desired value of setup time (tSRC). Selected calculated tSRC and CSRC examples are given in Table 2. Refer also to Table 5. Table 2. tSRC programmed by an ideal external capacitor Calculated CSRC value [µF] Setup delay tSRC [s](1)(2) Min. Typ.
STM6522 Typical operating characteristics Figure 8. Supply current (ICC) vs. temperature 3 2.5 ICC [µA] 2 1.5 1 0.5 0 –60 –40 –20 0 20 40 60 80 100 120 140 Temperature [˚C] 5.5 V 3.3 V 2V AM07328 Figure 9. Smart Reset™ delay (tSRC) vs. temperature, CSRC = 0.6 µF 9 8.5 8 t SRC [s] 3 Typical operating characteristics 7.5 7 6.5 6 –60 –40 –20 0 20 40 60 80 100 120 140 Temperature [˚C] 5.5 V 3.
Typical operating characteristics STM6522 Figure 10. Reset timeout period (tREC) vs. temperature 280 260 t REC [ms] 240 220 200 180 160 140 –60 –40 –20 0 20 40 60 80 100 120 140 Temperature [˚C] 5.5 V 3.3 V 2V AM07330 Figure 11. Smart Reset™ input voltage threshold vs. temperature 0.8 V ITH(SR) [V] 0.7 0.6 0.5 0.4 0.3 –60 –40 –20 0 20 40 60 80 100 120 140 Temperature [˚C] 5.5 V 3.
STM6522 4 Maximum ratings Maximum ratings Stressing the device above the ratings listed in Table 3: Absolute maximum ratings may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in Table 4: Operating and measurement conditions of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC and AC parameters 5 STM6522 DC and AC parameters This section summarizes the operating measurement conditions, and the DC and AC characteristics of the device. The parameters in Table 5: DC and AC characteristics that follows, are derived from tests performed under the measurement conditions summarized in Table 4: Operating and measurement conditions. Designers should check that the operating conditions in their circuit match the operating conditions when relying on the quoted parameters. Table 4.
STM6522 Table 5. Symbol DC and AC parameters DC and AC characteristics Parameter VCC Supply voltage range ICC Supply current (inputs in their inactive state, neither tREC nor tSRC in progress) VOL Reset output voltage low (active-low reset asserted) tREC Test conditions(1) Min. Typ.(2) 1.65 VCC = 5.0 V 2 VCC = 3.0 V 1.5 Max. Unit 5.5 V 3 µA µA VCC ≥ 4.5 V, sinking 3.2 mA 0.3 V VCC ≥ 3.3 V, sinking 2.5 mA 0.3 V VCC ≥ 1.65 V, sinking 1 mA 0.
Package mechanical data 6 STM6522 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark.
STM6522 Package mechanical data Figure 13. TDFN – 8-lead 2 x 2 x 0.75 mm, 0.5 mm pitch package outline D A B PIN 1 INDEX AREA E 0.10 C 2x 0.10 C 2x TOP VIEW 0.10 C C A1 A SEAT ING PLANE SIDE VIEW 0.08 C e b PIN 1 INDEX AREA 1 4 0.10 C A B Pin#1 ID L 5 8 BOTTOM VIEW 8070540_A Table 6. TDFN – 8-lead 2 x 2 x 0.75 mm, 0.5 mm pitch package mechanical data Dimension (mm) Dimension (inches) Symbol Min. Nom. Max. Min. Nom. Max. A 0.70 0.75 0.80 0.028 0.030 0.031 A1 0.00 0.
Package footprint 7 STM6522 Package footprint Figure 14. Landing pattern - TDFN – 8-lead 2 x 2 mm without thermal pad D P E E1 L b Table 7. AM00441 Parameters for landing pattern - TDFN – 8-lead 2 x 2 mm package Dimension (mm) Parameter 18/25 Description Min. Nom. Max. L Contact length 1.05 — 1.15 b Contact width 0.25 — 0.30 E Max. land pattern Y-direction — 2.85 — E1 Contact gap spacing — 0.65 — D Max. land pattern X-direction — 1.75 — P Contact pitch — 0.
STM6522 8 Tape and reel information Tape and reel information Figure 15. Carrier tape P0 D P2 T E A0 F Top cover tape W B0 Center lines of cavity K0 P1 User direction of feed AM03073v2 Table 8. Carrier tape dimensions Package W D TDFN8 8.00 +0.30 –0.10 1.50 +0.10/ –0.00 E P0 P2 F 1.75 4.00 2.00 3.50 ±0.10 ±0.10 ±0.10 ±0.05 A0 B0 K0 P1 T 2.30 ±0.05 2.30 ±0.05 1.00 ±0.05 4.00 ±0.10 0.250 ±0.05 Doc ID 17045 Rev 3 Unit Bulk qty.
Tape and reel information STM6522 Figure 16. Reel dimensions T 40 mm min. acces hole at slot location B D C N A Full radius Tape slot in core for tape start 25 mm min width G measured at hub AM00443 Table 9. 20/25 Reel dimensions Tape sizes A max. B min. C D min. N min. G T max. 8 mm 180 (7 inches) 1.50 13.0 +/– 0.20 20.20 60 8.4 +2/–0 14.
STM6522 Tape and reel information Figure 17. Tape trailer/leader End Top cover tape Start No components Components 100 mm min. T RA IL ER No components L EA D ER 160 mm min. 400 mm min. Sealed with cover tape User direction of feed AM00444 Figure 18. Pin 1 orientation User direction of feed Note: 1 Drawings are not to scale. 2 All dimensions are in mm, unless otherwise noted.
Part numbering STM6522 9 Part numbering Table 10. Ordering information scheme Example: STM6522 A A A A DG 6 F Device type STM6522 VCC monitoring, power-on reset A = no V CC monitoring, no power-on reset Smart Reset™ setup delay (tSRC); presence of internal input pull-up on all Smart Reset™ inputs (SRx) A = user-programmed (external capacitor); no input pull-up Output type A = both RST1 and RST2 open-drain, no pull-up, active-low Reset timeout period (tREC) A = 140 ms min.
STM6522 10 Package marking Package marking Table 11. Package marking Part number STM6522AAAADG6F Smart tSRC delay Reset™ control inputs(1) CSRC Power-on reset, VCC monitoring AL — RST1 RST2 tREC output(1) output(1) option AL, OD AL, OD A Topmark CAL, AAL 1. AL = active-low, AH = active-high, PU = with internal pull-up resistor, OD = open-drain. Figure 19.
Revision history 11 STM6522 Revision history Table 12. 24/25 Document revision history Date Revision Changes 03-Feb-2010 1 Initial release. 10-May-2010 2 Updated title, Features, Applications, Section 1, Figure 1, Table 1, Figure 2, Figure 3, Figure 4, Figure 5, Figure 6, Section 2.4, Figure 7, note 1 below Table 2, Section 2.6, added Section 2.7, Section 3, Table 5, Table 6, Table 7, Table 10, Section 8, Table 11.
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