The DS3605 is the integration of a nonvolatile (NV)
SRAM controller, real-time clock (RTC), CPU supervisor,
and temperature sensor to provide tamper protection
for secure transaction terminals and other
security-sensitive applications. The RTC can be used
with a common 32.768kHz 6pF watch crystal. Access
to the time-of-day and tamper monitoring is conducted
through an I²C-compatible interface.
In the event of a primary power failure, an external battery
source is automatically switched on to keep the
internal and external memory, RTC, and tamper-detection
circuitry alive. Additionally, output signals are provided
to reset the microprocessor, indicate battery
operation, and power external circuitry from either the
system supply or the battery.
Key Features
Applications/Uses
RTC with Leap Year Compensation Valid Up to 2100
Uses Standard 32.768kHz 6pF Watch Crystal
Four General-Purpose Tamper Detect Comparators with Associated Reference
On-Chip Temperature Sensing for Detection of Thermal Attacks
Programmable Temperature Set-Points
Programmable Memory Erase Time from 0.01 to 100 Seconds
