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參數(shù)資料
| 型號(hào)： | MC141556P1 |
| 廠商： | MOTOROLA INC |
| 元件分類(lèi)： | 總線控制器 |
| 英文描述： | UNIVERSAL SERIAL BUS CONTROLLER, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁(yè)數(shù)： | 18/21頁(yè) |
| 文件大?。?/td> | 160K |
| 代理商： | MC141556P1 |
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MC141556
6
MOTOROLA
PIN DESCRIPTION
VDD (Pin 1)
This is the +5V power pin of the chip.
OSC1 (Pin 2), OSC2 (Pin 3)
The OSC1 and OSC2 pins are the connections for the on-
chip oscillator. The crystal frequency is 24MHz . OSC1 may
be driven by an external oscillator if an external crystal circuit
is not used.
VSS (Pin 4)
This is the ground pin of the chip.
IICEN (Pin 5)
This is an input pin which requires the default input state
to determine the IIC Mode of Hub controller. During Power-
On Reset, pulling IICEN high configures MC141556 as a IIC
slave to allow customized parameters programmable. Pull-
ing this pin low disables IIC Mode and adopts default param-
eters. See Table1 Configuration selection for detail.
DP0 (Pin 6)
This is the upstream differential data plus I/O pin of the
Hub.
DM0 (Pin 7)
This is the upstream differential data minus I/O pin of the
Hub.
VDD3CAP (Pin 8)
This pin must connect an external capacitor for the inter-
nal 3.3V regulator which supply transceivers of all USB
ports.
OVR1 (Pin 9)
This is the over-current detection pin of the downstream
port 1. Active low is to indicate overcurrent condition occurs.
In GANG mode, OVR1 is the common detection pin for all
the four downstream ports.
PWRSW1 (Pin 10)
This is an output pin which can be used to switch on/off
the external power regulator for the downstream port 1.
Active high is to switch on the power. In GANG mode,
PWRSW1 is the common output pin for all the four down-
stream ports.
DP1 (Pin 11)
This is the differential data plus I/O pin of the downstream
port 1.
DM1 (Pin 12)
This is the differential data minus I/O pin of the down-
stream port 1.
OVR2 (Pin 13)
This is the over-current detection pin of the downstream
port 2. Active low is to indicate overcurrent condition occurs.
PWRSW2 (Pin 14)
This is an output pin which can be used to switch on/off
the external power regulator for the downstream port 2.
Active high is to switch on the power.
DP2 (Pin 15)
This is the differential data plus I/O pin of the downstream
port 2.
DM2 (Pin 16)
This is the differential data minus I/O pin of the down-
stream port 2.
OVR3 (Pin 17)
This is the over-current detection pin of the downstream
port 3. Active low is to indicate overcurrent condition occurs.
PWRSW3 (Pin 18)
This is an output pin which can be used to switch on/off
the external power regulator for the downstream port 3.
Active high is to switch on the power.
DP3 (Pin 19)
This is the differential data plus I/O pin of the down-
stream port 3.
DM3 (Pin 20)
This is the differential data minus I/O pin of the down-
stream port 3.
OVR4 (Pin 21)
This is the over-current detection pin of the downstream
port 4. Active low is to indicate overcurrent condition oc-
curs.
PWRSW4 (Pin 22)
This is an output pin which can be used to switch on/off
the external power regulator for the downstream port 4.
Active high is to switch on the power.
DP4 (Pin 23)
This is the differential data plus I/O pin of the downstream
port 4.
DM4 (Pin 24)
This is the differential data minus I/O pin of the down-
stream port 4.
OVR5/GANG/SCL (Pin 25)
When IIC Mode: this input pin acts as SCL, which is the
synchronizing clock input from the transmitter for IIC proto-
col. (Detailed description of the programming protocol will be
discussed in the IIC Communication section).
When non-IIC Mode: if self-powered, this input pin acts as
OVR5, which is overcurrent detection of downstream port 5;
active low is to indicate overcurrent occurs. If bus-powered,
this input pin acts as GANG to determine Power Control
Mode; pulling this pin low configures the Hub as Ganged
control, and pulling it high as Individual control.
PWRSW5/SDA (Pin 26)
When IIC Mode: this pin acts as SDA, which is a uni-
directional data line for IIC protocol. (Detailed description of
the programming protocol will be discussed in the IIC Com-
munication section).
When non-IIC Mode: if self-powered, this output pin is to
switch on/off the external power regulator for downstream
port 5; active high is to switch on the power.
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