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TMP92CZ26A
92CZ26A-368
3.16.1.2 Example
If using USB controller in TMP92CZ26A, above setting is needed.
1) Pull-up of D
+
pin
In the USB standard, in Full Speed connection, D
+
pin must be set to pull-up.
And this pull-up is needed ON/OFF control by S/W.
Recommendation value: R1=1.5kΩ
2) Add cascade resistor of D
+
, D
-
signal
In the USB standard, in D+, D
-
signal, cascade resistor must be added to each
signal. Recommendation value : R2=27Ω, R3=27Ω
3) Flow current provision of the Connector connection and D
+
pin, D
-
pin
In D
+
, D
-
pin of TMP92CZ26A, level must be fixed for flow current provision
when not using (it is not connect to host). In this case, it is showed that method of
controlling the pull-down resistor for fixed level by using detection signal of
connector connection.
Recommendation value: R4=10kΩ, R5=10kΩ
It is showed as example of the connector connection detection that method of
detecting by using VBUS (5V voltage).
Note: If rising of waveform is solw, recommned that likely baffering for waveform.
Recommendation value: R6=60kΩ, R7=100kΩ
(VBUS reducing current when suspend<500μA)
4) Connect oscillator of 10MHz to X1,X2, or input 48MHz clock to X1USB
If using USB by using the combination external 10MHz oscillator and internal,
Stage of external hub which can be used is restricted by the precision of internal
(Max 3 stages).
If 5 stages connection is needed for external hub, it is needed that input 48MHz
clock from X1USB pin (Restriction ≤ 2500ppm.)
5) HOST side pull-down resistor
In the USB regulation, set pull-down D
+
pin and D
-
signal at USB_HOST side.
Recommendation value: R8=15kΩ, R9=15kΩ
Note: Above connection and resistor etc, is example. Operation is not guranteed. Please confirm the
newest USB standar and the operation on your setting.
48MHz
USB host
VCC
VSS
INTx (detect rising)
PorTXX
D+
D−
R2
R3
R6
TMP92CZ26A
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”