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| HDMI2C1-14HD Datasheet, PDF (19/32 Pages) STMicroelectronics – HPD pull down and signal conditioning | |||
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HDMI2C1-14HD
Electrical characteristics
Table 7. HPD, HEAC, and utility line electrical characteristics(1)
Symbol
Parameter
Test conditions
Value
Min. Typ.
IPULL_DOWN Pull-down current in HPD block
VTH_HPD HPD input threshold
CIN_HPD
CIN_UTILIT Input capacitance
Y
VDD_5V = 0 V, VBIAS = 0 V
f = 1 MHz, VOSC = 30 mV
fCUT_HEAC Cut-off frequency of HEAC bus
1. Tamb = 25°C, VDD_5V = 5 V, unless otherwise specified.
15
1.0
9
500
Max.
25
1.7
Unit
µA
V
pF
MHz
Table 8. DDC bus (SDA and SCL lines) electrical characteristics(1)
Symbol
Parameter
Test conditions
Value
Unit
Min. Typ. Max.
VTup_BUS Upward input voltage threshold on bus side
VTdown_BUS Downward input voltage threshold on bus side
1.5
VHYST_BUS Input hysteresis on bus side
1.0
VOL_BUS Output low level
Current sunk by SDAï and SCL
pin is 3 mA
TRISE_BUS Output rise-time (30% to 70%)
CBUS = 750 pF(2)
RUP = 2 Kï //47 Kï + 10%(3)
TFALL_BUS Output fall-time (30% to 70%)
VTup_IC Upward input voltage threshold on IC side
55
VTdown_IC Downward input voltage thresholds IC side
35
VOL_IC Output low level on IC side
Current sunk by SDA_IC or
SCL_IC pins is 500 µA
3.5
V
V
1.3
V
0.35
V
500
ns
50
ns
60 65 %VDD_IC
40 45 %VDD_IC
20 %VDD_IC
CIN_DDC Input capacitance on DDC link
VDD_5V = 0 V
VDD_IC = 0 V
VDD_CEC = 0 V
VBIAS = 0 V, f = 1 MHz
VOSC = 30 mV
9 17(4)
pF
1. Tamb = 25 °C, VDD_5V = 5 V, VDD_IC = 1.8 V, unless otherwise specified
2. Maximum load capacitance allowed on I2C entire link (cable + connector) is 750 pF in HDMI 1.4 specification.
3. Two pull-up resistors in parallel (sink 47 kïï + source 2 kï).
4. Maximum capacitance allowed at connector output is 50 pF in HDMI 1.4 specification
DocID023674 Rev 2
19/32
32
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