參數(shù)資料
型號(hào)： UPD720012
廠商： NEC Corp.
英文描述： HUB CONTROLLER FOR UNIVERSAL SERIAL BUS
中文描述： 集線器控制器通用串行總線
文件頁數(shù)： 10/36頁
文件大?。?/td> 414K
代理商： UPD720012
10
Data Sheet S13918EJ3V0DS
μ
PD72012
1.2 Tables by Pin Function
Table 1-1. Oscillator Circuit Switching Control (CLKSEL)
CLKSEL
Type of oscillator circuit
L
Input clocks from 48 MHz oscillator
H
Clock input using 4 MHz crystal resonator (drive circuit is incorporated)
Remark
Directly connect to V
DD
when using CLKSEL=“H”. Even 5 V is no trouble.
Table 1-2. Power Mode/Downstream Port Number Control (PSSEL, PVSEL)
PSSEL
PVSEL
Power mode
Port #1
Port #2
Port #3
Port #4
Port #5
L
L
Self-power
Note 1
{
{
{
{
×
L
H
Self-power
Note 1
{
{
{
{
{
H
L
Bus power
Note 2
{
{
{
{
×
H
H
Prohibited
Note 3
–
–
–
–
–
Notes 1.
Do not cut-off clock input when using self-power. If it is cut-off, internal functions stop and operation
may not be possible even if clocks are input again.
When using bus power, up to four ports can be used.
The combination PSSEL=“H”, PVSEL=“H” is prohibited. Operation in this case is not guaranteed.
2.
3.
Remark
Also set according to this table when setting the number of ports in a Mask ROM code product to up to
5 ports. Directly connect data lines of unused ports to GND.
Table 1-3. Handling of Pins CS1 to CS5 According to Setting of wHubCharacteristics Field of HUB Class
Descriptor
wHubCharacteristics
Bits 4, 3
CS1
CS2
CS3
CS4
CS5
0b00
Common in all ports
0b01
Port #1
Port #2
Port #3
Port #4
Port #5
0b10 or 0b11
Not available
Not available
Not available
Not available
Not available
Remark
Connect pins CS1 to CS5 to the Over Current Detect output pin of the power switch IC.
Clamp an unused or unavailable CS1 to CS5 pin to 3.3 V.
Table 1-4. Handling of Pins PP1 to PP5 According to Setting of wHubCharacteristics Field of HUB Class
Descriptor
wHubCharacteristics
Bits 1, 0
PP1
PP2
PP3
PP4
PP5
0b00
Common in all ports
0b01
Port #1
Port #2
Port #3
Port #4
Port #5
Remark
Connect pins PP1 to PP5 to the Port Power Control input pin of the power switch IC.
Leave an unused or unavailable PP1 to PP5 pin open.
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