X9440 Datasheet, PDF (17/21 Pages) Intersil Corporation – Mixed Signal with SPI Interface

BASIC APPLICATION (continued)
Programmable Oscillator with Memory
X9440
SCL
SDA
V_H
R
V_L V_W
C
Frequency ∝ R, C
Duty Cycle ∝ R₁, R₂, R₃
+5V
V+
–
+
V–
9440
V_OUT
R₂
+5V
R₃
R₁
Programmable Schmitt Trigger with Memory
V_R
V_H
R
V_W
V_UL
=
R_{-----1-----+----}R_-----2-
R₂
V_W
–
R_-----1-
R₂
V_OUT(min)
V_LL
=
R_{-----1-----+----}R_-----2-
R₂
V_W
–
R_-----1-
R₂
V_O
U
T
(
m
ax
)
V_L
V_S
R₁
9440
– ^V+
+
V–
R₂
V_OUT
V_OUT
V_S
V_LL
V_UL
17
FN8200.0
March 28, 2005