L9963T datasheet(29/45 Pages) STMICROELECTRONICS

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Figure 15. Isolated SPI pulse shape and logical meaning

3.4.4.1

ISO communicator receiver and transmitter

An isolated receiver and transmitter are connected to the couple of pins and ISOP/M. Depending on the

communication phase, they can be enabled or disabled.

3.4.4.1.1

ISO communicator receiver

The receiver is able to convert a differential input signal into a single ended signal that is provided to the logic:

•

While in Normal state, in order to guarantee a correct communication, the input common mode must stand

within VCM_ISO_IN limits.

•

When in Stand-by state, the ISOP and ISOM pins are not biased with a common mode. If the device

receives a series of differential pulses longer than NMIN_ISO_WAKEUP_EDGES, a wake up condition is

triggered. Pulse amplitude must be higher than Wakeup_thr in order to be counted.

3.4.4.1.1.1

Electrical parameters - ISO receiver

All parameters are tested and guaranteed in the following conditions, unless otherwise specified: 4.5 V ≤ VVDD ≤

5.5 V ; -40 °C < Tambient < 105 °C

Table 24. Isolated receiver electrical parameters

Symbol

Parameters

Test condition

Min Typ Max Unit

VDIFF_ISO_IN

Differential input voltage

threshold

|V(ISOP) – V(ISOM)|

VCM_ISO_IN = 0 V , VCM_ISO_IN = 1.4 V

180 250 320

VCM_ISO_IN

Input voltage common mode

range

|V(ISOP) + V(ISOM)| /2 Design info

1.2

RISO_DIFF

Differential input resistance

VIF enabled, no communication Resistance

measured between ISOP and ISOM pins

kΩ

RISO_EXT

External termination resistance

connected between ISOxP and

ISOxM pins

Application info

120

Ω

IISO_LEAK

ISO input leakage current

0V < ISOP/M, ISOP/M < VDD

μA

TDET_MIN_WU

Minimum pulse duration to be

detected

Design info

Wakeup_thr Wake up comparator threshold

|V(ISOP) – V(ISOM)|

80 150 230

L9963T

Serial communication interface

DS13590 - Rev 4

page 29/45

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