FUSB302MPX. datasheet(21/35 Pages) ONSEMI

21 / 35 page

www.fairchildsemi.com

FUSB302

• Rev. 2

www.onsemi.com

Table 8.

Measure

Address: 04h

Reset Value: 0x0011_0001

Type: Read/Write

Bit #

Name

R/W/C Size (Bits)

Description

Reserved

N/A

Do Not Use

MEAS_VBUS

R/W

0: MDAC/comparator measurement is controlled by

MEAS_CC* bits.

1: Measure VBUS with the MDAC/comparator. This requires

MEAS_CC* bits to be 0.

5:0

MDAC[5:0]

R/W

Measure Block DAC data input. LSB is equivalent to 42 mV of

voltage which is compared to the measured CC voltage. The

measured CC is selected by MEAS_CC2, or MEAS_CC1 bits.

MDAC[5:0]

MEAS_VBUS=0

MEAS_VBUS=1

Unit

00_0000

0.042

0.420

00_0001

0.084

0.840

11_0000

2.058

20.58

11_0011

2.184

21.84

11_1110

2.646

26.46

11_1111

>2.688

26.88

Table 9.

Slice

Address: 05h

Reset Value: 0x0110_0000

Type: Read/Write

Bit #

Name

R/W/

Size (Bits)

Description

7:6

SDAC_HYS[1:0]

R/W

Adds hysteresis where there are now two thresholds, the lower

threshold which is always the value programmed by

SDAC[5:0] and the higher threshold that is:

11: 255 mV hysteresis: higher threshold = (SDAC value + 20hex)

10 = 170 mV hysteresis: higher threshold = (SDAC value + Ahex)

01 = 85 mV hysteresis: higher threshold = (SDAC value + 5)

00 = No hysteresis: higher threshold = SDAC value

5:0

SDAC[5:0]

R/W

BMC Slicer DAC data input. Allows for a programmable threshold

so as to meet the BMC receive mask under all noise conditions.

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