Z8E520 Datasheet, PDF (15/43 Pages) Zilog, Inc. – 1.5 MBPS USB Device Controller

Zilog
Z8E520/C520
1.5 MBPS USB Device Controller
Port B. Port B (0–5) includes a Quadrature configuration comparator with programmable reference voltages (Ta-
(Figure 9), with programmable current sink and an analog bles 4–8).
1
+V
+V
Pad
AC
AC
VR1
VR2
VR3
Decode
AC = Analog Comparator Mode
Figure 9. Port B (0–5) Quadrature Configuration
PORT B (0–5) QUADRATURE CONFIGURATION
Table 4. Programmable Voltage Threshold
Symbol
Parameter
V_R1
V_R2
V_R3
Ratio
Voltage Reference 1
Voltage Reference 2
Voltage Reference 3
Ratio Accuracy
Note:
1. Greatest delta vs. specified delta.
Min.
0.21 V_CC
0.31 V_CC
0.41 V_CC
Max.
0.29 V_CC
0.39 V_CC
0.49 V_CC
5
Units
V
V
V
%
Conditions
Note (1)
DS97KEY2005
PRELIMINARY
15