Teridian 71M6403, Manual

Page: 73 / 75

71M6403
Electronic Trip Unit
SEPTEMBER 2006
Page: 73 of 75
©
2006 TERIDIAN Semiconductor Corporation
REV 1.0
Pin Descriptions
Power/Ground Pins
NAME PIN # TYPE DESCRIPTION
GNDA
76,91 P
Analog ground: This pin should be connected directly to the analog ground plane.
Recommend a common ground plane consisting of both GNDA and GNDD.
GNDD
1, 40, 75, 92 P
Digital ground: This pin should be connected directly to the digital ground plane.
Recommend a common ground plane consisting of both GNDA and GNDD.
V3P3A
77 P
Analog power supply: A 3.3V analog power supply should be connected to this pin.
Recommend a common power plane consisting of both V3P3A and V3P3D.
V3P3D
9 P
Digital power supply: A 3.3V digital power supply should be connected to this pin.
Recommend a common power plane consisting of both V3P3A and V3P3D.
V2P5 73 O Output of the 2.5V regulator. A 0.1µF capacitor to GNDA should be connected to this pin.
VBAT 72 O
Battery backup power supply pin. A battery or super-capacitor may be connected between
VBAT and GNDD. If no battery is used, connect VBAT to V3P3D.
VLCD 96 P LCD power supply. The DC source for the LCD driver circuitry is connected here.
NC
32,33,36,
42,43,44,
47,55,90,95
-- No Connect
Analog Pins
NAME PIN # TYPE DESCRIPTION
I0
I1
I2
I3
I4
I5 84
80
83
79
82
78
I Line Current Sense Inputs: These pins are voltage inputs to the internal A/D converter.
Typically, they are connected to the output of a current transformer.
V1
V2
INEUTRAL 88
87
86
I
Comparator Inputs - voltage inputs to the internal comparator: The voltages applied to these
pins are compared to an internal BIAS voltage of 1.6V. If the input voltage is above VBIAS, the
corresponding comparator output will be high (1). V1 is a status signal to the reset circuitry. It
may also be used to disable the watchdog timer. Place a 0.1µF capacitor between pin V1 and
GNDA. The V2 and INEUTRAL comparator outputs are maintained in
COMP_STAT as follows:
bit 1 = V2, bit 3 = INEUTRAL. A typical application is to sense the voltage on the DC supply.
VBIAS 81 O Reference voltage used by the power fault detection circuit.
VREF 85 I/O Voltage Reference for the ADC. A 0.1µF capacitor to GNDA should be connected to this pin.
CK38 94 I Low-frequency clock input. Provides time base for RTC, watchdog timer and ZP8.
VDRV 7 O Voltage boost output.
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