參數(shù)資料
型號: TPS23841_07
廠商: Texas Instruments, Inc.
英文描述: HIGH-POWER, WIDE VOLTAGE RANGE, QUAD-PORT ETHERNET POWER SOURCING EQUIPMENT MANAGER
中文描述: 大功率,寬電壓范圍,四端口以太網(wǎng)供電設(shè)備管理器
文件頁數(shù): 25/52頁
文件大小: 1011K
代理商: TPS23841_07
www.ti.com
PMM Legacy
PMM Legacy function is used to detect PDs that are non compliant. Legacy detection uses a current source
(typically 3.5 mA) as a test current while the A/D measures the average voltage for approximately 18 ms. The
waveform shown in
Figure 12
is the Legacy function charging a 10-
μ
F capacitor. The capacitance charges to a
value that is no greater than 20V below the P port voltage. As the capacitor is charging the A/D is accumulating
counts in the voltage A/D register.
Figure 13
shows the relationship between port capacitance and the number of
counts. A user can characterize non-compliant PD's signatures and use the Legacy function to recognize these
devices.
TPS23841
SLUS745–NOVEMBER 2006
POWER MANAGEMENT MODE FUNCTIONAL DESCRIPTION (continued)
Figure 12.
Figure 13.
25
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