Toshiba TLCS-900/H1 Series Manual page 195

3.10.1.2 Example
USB host
USB host
USB
Connector
GND
VBUS
R8
R9
The above setting is required when using the TMP92CH21's USB controller.
1) Pull-up of D
・ In the USB standard, in Full Speed connection, the D
The ON/OFF control of this pull-up must be by S/W.
Recommended value: R1=1.5kΩ
2) Add cascade resistor of D
・ In the USB standard, for a D+ or D
each signal. Recommended value : R2=27Ω, R3=27Ω
3) Flow current provision of the Connector connection and D
・ For the D
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=10kΩ, R5=10kΩ
・ The example shows use of the connector detection method using VBUS (5V
voltage).
Note: Where waveform rise is solw, buffering of waveform is recommended .
Recommended value: R6=60kΩ, R7=100kΩ
(VBUS current consumption when suspended is <500μA)
4) Connection of 9MHz oscillator to X1, X2.
・ When using USB with a combination of 9MHz external oscillator and internal
PLL, the number of external hub stages which can be used is restricted by the
accuracy of the internal PLL (Max 3 stages).
5) HOST side pull-down resistor
・ In the USB standard, set pull-down D
Recommended value: R8=15kΩ, R9=15kΩ
Note: The above connections and resistor values, etc, are given as examples only. Operation is not guaranteed.
Please confirm the latest USB standard specifications and operations on your system.
USB
Connector
R6
R7
USB
cable
R1
R4
OFF at
"H"
+
pin
+ -
, D signal
+ -
and D pin of the TMP92CH21, the level must be fixed for flow current
92CH21-193
USB device
TMP92CH21
VCC
VSS
INTx (detect rising)
PorTXX
D+
R2
D−
R3
R5
OFF at
"H"
+
pin must be set to pull-up.
-
signal, a cascade resistor must be added to
+ -
pin and D signal at USB_HOST side.
TMP92CH21
X1
X2
9MHz
+ -
pin, D pin
2009-06-19