71m6403 Teridian Semiconductor Corporation, 71m6403 Datasheet - Page 13

• Manufacturer Part Number: 71m6403
• Description: Electronic Trip Unit
• Manufacturer: Teridian Semiconductor Corporation

Real-Time Monitor
The CE contains a Real Time Monitor (RTM), which can be programmed to monitor four selectable CE RAM locations at full
sample rate. The four monitored locations are serially output to the TMUXOUT pin via the digital output multiplexer at the
beginning of each CE code pass (see the Test Ports Section for details)
Power Up Short Circuit Detection Time
The 71M6403 detects a short circuit condition within less than 5 msec. (T2) after application of its power and a stable reference
clock. This delay includes the firmware startup time for both the CE and the MPU, and for the CE to complete its initial
measurements. The following diagram shows the timing delay of a CE trip indication relative to application of power and the
reference clock.
The T1 delay is a system parameter dependent on the system clock architecture. T1 could be the start up time for an external
oscillator powered from the same power source as the 71M6403, or T1 could be the delay from a system wide reference clock.
If the reference clock is already stable prior to application of power to the 71M6403 (using a system wide reference clock), the
T1 delay is eliminated. The resultant start up delay reduces to T2 assuming a “clean” application of power to the 71M6403.
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CE FAULT_PULSE
Reference Clock
71M6403 Power
CE STROBE
T1: Delay to stable reference clock operation
T2: Delay to CE FAULT_PULSE assertion and
©
first CE STROBE pulse ( < 5 msec)
2006 TERIDIAN Semiconductor Corporation
Power Up Detection Time
T1
T2
Electronic Trip Unit
71M6403
SEPTEMBER 2006
REV 1.0