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參數資料
| 型號： | ISP1122NB |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 總線控制器 |
| 英文描述： | Universal Serial Bus stand-alone hub |
| 中文描述： | UNIVERSAL SERIAL BUS CONTROLLER, PDIP32 |
| 封裝： | 0.400 INCH, SHRINK, PLASTIC, SOT-232-1, DIP-32 |
| 文件頁數： | 22/48頁 |
| 文件大小： | 1159K |
| 代理商： | ISP1122NB |
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Philips Semiconductors
ISP1122
USB stand-alone hub
Product specification
Rev. 03 — 29 March 2000
22 of 48
9397 750 07002
Philips Electronics N.V. 2000. All rights reserved.
[1]
[2]
[3]
Default value at reset if no external EEPROM is present.
Modifies the Hub Descriptor field ‘bPwrOn2PwrGood’, see
Table 14
.
Modifies the Hub Descriptor field ‘MaxPower’, see
Table 14
.
11. Hub power modes
USB hubs can either be self-powered or bus-powered.
Self-powered —
Self-powered hubs have a 5 V local power supply on board which
provide power to the hub and the downstream ports. The USB Specification Rev. 1.1
requires that these hubs limit the current to 500 mA per downstream port and report
overcurrent conditions to the host. The hub may optionally draw 100 mA from the
USB supply (V
BUS
) to power the interface functions (
hybrid-powered
).
Bus-powered —
Bus-powered hubs obtain all power from the host or an upstream
self-powered hub. The maximum current is 100 mA per downstream port. Current
limiting and reporting of overcurrent conditions are both optional.
Power switching of downstream ports can be done
individually
or
ganged
, where all
ports are switched simultaneously with one power switch. The ISP1122 supports both
modes, which can be selected using input INDV (see
Table 4
).
11.1 Voltage drop requirements
11.1.1
Self-powered hubs
Self-powered hubs are required to provide a minimum of 4.75 V to its output port
connectors at all legal load conditions. To comply with Underwriters Laboratory Inc.
(UL) safety requirements, the power from any port must be limited to 25 W (5 A at
5 V). Overcurrent protection may be implemented on a global or individual basis.
Table 23: Configuration bits
Bit
Function
Value
(Bin)
see
Table 4 “Mode selection”
see
Table 4 “Mode selection”
0
[1]
must always be programmed to logic 0
0
[1]
100 ms (bPwrOn2PwrGood = 32H)
1
500 ms (bPwrOn2PwrGood = FAH)
0
[1]
string descriptors disabled
1
string descriptors enabled (strings:
“Philips Semiconductors”, “ISP1122”)
0
internal analog overcurrent detection
circuit disabled; overcurrent pins OCn
function as digital inputs (TTL level)
1
[1]
internal analog overcurrent detection
circuit enabled
00
[1]
100 mA (MaxPower = 32H)
1X
500 mA (MaxPower = FAH)
01
0 mA (MaxPower = 00H)
Description
C0
C1
C2
C3
OPTION
INDV
reserved
PwrOn2PwrGood
[2]
C4
string descriptor enable
C5
internal analog overcurrent
detection enable
C7, C6
MaxPower
[3]
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