TMP92CF30
2009-06-12
92CF30-341
3.16.1.2 Example
The above setting is required If when using the TMP92CF30’s USB controller.
1)
Pull-up of D
+
pin
・
In the USB standard, in Full Speed connection, the D
+
pin must be set to pull-up.
The ON/OFF control of this pull-up must be by S/W.
Recommended value: R1
=
1.5k
Ω
2)
Add cascade resistor of D
+
, D
-
signal
・
In the USB standard, for a D+ or D
-
signal, a cascade resistor must be added to
each signal. Recommended value : R2
=
27
Ω
, R3
=
27
Ω
3)
Flow current provision of the Connector connection and D
+
pin, D
-
pin
・
For the D
+
and D
-
pin of the TMP92CF30, the level must be fixed for flow current
provision when not in use (when not connected to host). In this case, the
connector detection signal is used to control the pull-down resistor which
determines the level.
Recommended value: R4
=
10k
Ω
, R5
=
10k
Ω
・
The example shows use of the connector detection method by using VBUS (5V
voltage).
Note: Where waveform rise is solw, buffering of wabeform is recommended.
Recommended value: R6
=
60k
Ω
, R7
=
100k
Ω
(VBUS current consumption when suspended is
<
500
μ
A)
4)
Connection of 10MHz oscillator to X1,X2, or input 48MHz clock to X1USB
・
When using USB with a combination of 10MHz external oscillator and internal
PLL, the number of external hub stages which can be used is restricted by the
accuracy of the internal (Max 3 stages).
・
If 5 stages connection is required for external hub, it is required that input
48MHz clock from X1USB pin (Restriction
≤
±
2500ppm.)
48MHz
USB host
VCC
VSS
INTx (detect rising)
PorTXX
D
+
D
−
R2
R3
R6
TMP92CF30
10MHz
R4
R5
X1
X2
X1USB
GND
VBUS
USB
Connector
USB
Connector
USB
cable
R8
R9
R7
R1
USB host
USB device
OFF at
"H"
OFF at
“H”
Содержание TLCS-900/H1 Series
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