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Product folder
A6155
(obsolete, please use EM6152) 5V Regulator with Windowed Watchdog&Sleep Mode Detection |
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| General description |
The A6155 offers a high level of integration by combining voltage regulation, voltage monitoring and software monitoring in an 8 lead package. The voltage regulator has a low dropout voltage (typ. 380mV at 100mA) and a low quiescent current (155mA). The quiescent current increases only slightly in dropout prolonging battery life. Built-in protection includes a positive transient absorber for up to 60V (load dump) and the ability to survive an unregulated input voltage of –20V (reverse battery). The input may be connected to ground or a reverse voltage without reverse current flow from the output to the input. Comparator monitors the voltage applied at the VIN input comparing it with an internal 1.275V reference. The power-on reset function is initialized after VIN reaches 1.275V and takes the reset output inactive after TPOR depending of external resistance. The reset output goes active low when the VIN voltage is less than 1.275V. The /RES and /EN outputs are guaranteed to be in a correct state for a regulated output voltage as low as 1.2V. The watchdog function monitors software cycle time and execution. If software clears the watchdog too quickly (incorrect cycle time) or too slowly (incorrect execution) it will cause the system to be reset. The system enable output prevents critical control functions being activated until software has successfully cleared the watchdog three times. Such a security could be used to prevent motor controls being energized on repeated resets of a faulty system. If the microcontroller does not work that means no signal on the TCL input the A6155 goes in a standby mode (CAN-bus sleep detector).
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| Features |
• Can-bus sleep mode detector
• Highly accurate 5V LDO, 100mA guaranteed output
• Low dropout voltage, typically 380mV at 100mA
• Low quiescent current, typically 155mA
• Standby mode, maximum current 350mA (with 100mA load on OUTPUT)
• Unregulated DC input can withstand -20V reverse battery and +60V power transients
• Fully operational for unregulated DC input voltage up to 26V and regulated output voltage down to 3.0V
• Reset output guaranteed for regulated output voltage down to 1.2V
• No reverse output current
• Very low temperature coefficient for the regulated output
• Current limiting
• Comparator for voltage monitoring, voltage reference 1.275 V
• ±2% voltage reference accuracy at +25°C (3 to 5.5 V)
• ±2.7% voltage reference accuracy from -40 to +85°C (3 to 5.5V)
• Programmable reset voltage monitoring
• Programmable power-on reset (POR) delay
• Watchdog with programmable time windows guarantees a minimum time and a maximum time between software clearing of the watchdog (windowed watchdog, window watchdog)
• Time base accuracy ±10%
• System enable output offers added security
• TTL/CMOS compatible
• -40 to +85°C temperature range
• On request extended temperature range -40 to +125°C
• DIP8 and SO8 packages
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| Applications |
Automotive systems
Cellular telephones
Security systems
Battery powered products
High efficiency linear power supplies
Industrial electronics
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| Applications notes |
| • Windowed watchdog enhances security in automotive and industrial applications |
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AN602
144 Kb |
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| • Basic principles for using EM Supervisory ICs in noisy environment |
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AN600
45 Kb |
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