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RREF (Pin 10). Reference setting resistor. Resistor must be
10 kOhms, ±2%.
SDO (Pin 16). This pin provides the serial data output when
SPI mode communications have been selected. This pin is
not used in I2C mode operation.
BOX (Pin 17). Black box keying output is an active High,
CMOS-level signal used to key in the black box for cap-
tions/text displays. This output is in a high-impedance state
when the background attribute has been set to semi-trans-
parent.
ZiLOG
Power Supply
VSS (Pins 11). These pins are the lowest potential power
pins for the analog and digital circuits. They are normally
tied to system ground.
VDD (Pin 12). The voltage on this pin is nominally 5.0
Volts, and may range between 4.75 to 5.25 Volts with re-
spect to the VSS pins.
Note: The recommended printed circuit pattern for implement-
ing the power connection and critical components is ref-
erenced in the Recommended Application Information
section on page 49.
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