SI3459 datasheet(5/57 Pages) SILABS

Part #	SI3459

Description	OCTAL IEEE 802.3AT POE PSE CONTROLLER

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Manufacturer	SILABS [Silicon Laboratories]

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Si3459

Rev. 1.1

5

Power Supply Currents3

VPWR Supply Current

IVPWR

During normal operation

—

2

5

mA

VDD Supply Current

IDD

—18

25

mA

Detection Specification

Detection Voltage

when RDET = 25.5k

VPORTn

Primary detection voltage

—

–4.0

–2.8

V

Secondary detection voltage

–10

–8.0

—

V

Detection Current Limit

IDET

Measured when VPORTn =0V

—

3

4.9

mA

Minimum Signature

Resistance @ PD

RDET_MIN

15

—

19

k



Maximum Signature

Resistance @ PD

RDET_MAX

26.5

—

33

k



Shorted Port Threshold

RSHORT

150

—

400



Open Port Threshold

ROPEN

100

—

400

k



Classification Specifications

Classification Voltage

VCLASS

0 mA < ICLASS < 45 mA

–20.5

—

–15.5

V

Classification Current

ICLASS

Measured when VPORTn =0V

55

—

95

mA

Classification Current Region

ICLASS_RE-

GION

Class 0

0

—

5

mA

Class 1

8

—

13

mA

Class 2

16

—

21

mA

Class 3

25

—

31

mA

Class 4

35

—

45

mA

Table 1. PSE Port Interface Recommended Operating Conditions1 (Continued)

Parameter

Symbol

Test Condition

Min

Typ

Max

Unit

Notes:

1. Port voltages are referenced with respect to VPWR. All other voltages are referenced with respect to GND. These

specifications apply over the recommended operating voltage and temperature ranges of the device unless noted

otherwise. Typical performance is for TA =25°C, VDD =AGND + 3.3 V, AGND and DGND = 0 V, and VPWR at 48 V.

2. For a description of the detailed behavior of VDD UVLO, see “4.2.2. Global Event Register and Global Event COR

(0x02, 0x03)” .

3. Positive values indicate currents flowing into the device; negative currents indicate current flowing out of the device.

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