參數(shù)資料
型號(hào)： TMDS461PZT
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝： PLASTIC, TQFP-100
文件頁(yè)數(shù)： 2/43頁(yè)
文件大小： 3111K
代理商： TMDS461PZT
DEVICE POWER
ELECTRICAL CHARACTERISTICS
5V DETECT and HOT PLUG DETECT
SLLS915 – JANUARY 2009 ............................................................................................................................................................................................... www.ti.com
The TMDS461 is designed to operate from a single 3.3-V supply voltage. The TMDS461 has three power modes
of operation. These three modes are referred to as normal mode, standby mode, and low-power mode.
Normal mode is designed to be used during typical operating conditions. In normal mode, the device is fully
functional and consumes the greatest amount of power.
Standby mode is designed to be used when reduced power is desired, but DDC and HPD communication must
be maintained. Standby mode can be enabled via the I2C interface (See Table 8) only. In standby mode, the
high-speed TMDS data and clock channels are disabled to reduce power consumption. The internal I2C logic and
DDC function normally. HPD[1:4] of the selected port follows HPD_SINK. HPD[1:4] of the non-selected port
follows 5V_PWR[1:4].
Low-power mode is designed to consume the least possible amount of power while still applying 3.3 V to the
device. Low-power mode can be enabled by either the LP pin or by local I2C (See Table 8). In low-power mode,
all of the inputs and outputs are disabled with the exception of the internal I2C logic and LP pin.
The clock-detect feature in the TMDS461 provides an automatic power-management feature in normal mode. if
no valid TMDS clock is detected, the terminations on the input TMDS data lines are disconnected, and the TMDS
outputs are high-Z. As soon as a valid TMDS clock is detected, the terminations on the TMDS data lines are
connected, the TMDS outputs come out of high-Z, and the device is fully functional and consumes the greatest
amount of power.
over recommended operating conditions (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ICC
Normal-mode supply current
LP = HIGH TMDS: VID(pp) = 1200 mV, 3 Gbps TMDS data pattern;
185
220
mA
HPD_SINK = HIGH, S1/S2 = LOW/LOW, LOW/HIGH, HIGH/HIGH,
HIGH/LOW.
ISTBY
Standby supply current
LP = HIGH, TMDS: VID(pp) = 1200 mV, 3 Gbps TMDS data pattern;
3
5.5
mA
HPD_SINK = HIGH, (See Table 8, Register 0x02[7:6] =[0:1]. Note
that standby power mode is only available when TMDS461 is
configured in I2C mode.
ISD
Shutdown current
LP = LOW.
300
555
A
Normal-mode supply current,
LP = HIGH, No TMDS input clock, HPD_SINK =HIGH, S1/S2 =
17
INCLK
with no active TMDS input
LOW/LOW,
20
mA
clock
LOW/HIGH, HIGH/HIGH, HIGH/LOW.
5V DETECT: TMDS461 incorporates 5V detect logic on each input port. 5V_PWR is the 5V that an HDMI/DVI
source provides to an HDMI/DVI sink. As soon as TMDS461 detects a high on any of the 5V_PWR[1:4] signals,
the 5V_Ind pin which is 5V Power detect indicator goes high. In I2C mode, a micro controller connected to
TMDS461 can read the status of 5V_PWR[x] signals by reading (See Table 7 ) I2C register 0x01.
Hot Plug Detect: The TMDS461 is designed to support the Hot Plug indication to the input ports. For the
selected port, the state of the Hot Plug output (HPD[1:4]) follows the state of the Hot Plug input (HPD_SINK). For
the non selected ports, the state of the Hot Plug outputs follows logic state of 5V_PWR. (See Table 1). HPD[x]
are internally connected to 5V_PWR[x] via 1K
resistor as shown in Figure 1(b). Thus even if the TMDS461 is
powered off, HPD[x] will still follow 5V_PWR[x]. When the HDMI transmitter does not have the capability of
detecting the TMDS receiver termination, using the HPD signal as a reference for sensing port selections is the
only possible method. Thus it is recommended that HPD_SINK can be held low before port selection is done and
then forced high after port selection, this ensures that HPD[x] of the selected port is pulsed High-to-Low at port
selection before HPD[x] follows HPD_SINK.
In Standby power savings mode, HPD functions similar to normal mode. In low (LP) power savings mode, the
HPD[x] follows 5V_PWR[x].
10
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s) :TMDS461
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