L9965TS datasheet(31/62 Pages) STMICROELECTRONICS

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Symbol

Parameter

Test condition

Min Typ Max Unit

NCS

RIN_PD

Input pulldown resistor. Applies to SCK,

SDI

0.4

1.6

MΩ

SCLK SDI

RIN_PU

Input pullup resistor. Applies to NCS

0.4

1.6

MΩ

NCS

5.7.2

Isolated Vertical Interface (VIF)

The IC integrates communication ports to interface up to NVIF_STACK devices in daisy chain by isolated cables

twisted pair (VIF).

The VIF supports capacitive to capacitive, transformer to transformer, transformer to capacity and vice-versa

communication isolation in single access or dual ring daisy-chain for enhanced safety.

The VIF receiver port is always enabled, regardless of the device operating state, and the sensitivity to received

commands depends upon the device state as reported in Table 31 below.

Table 31. VIF receiver sensitivity

FSM State

Received commands

Effect

DEEP SLEEP/CYCLIC COUNT

•

FAULT/WAKEUP tone

•

CYCLIC_WAKEUP tone

FSM transition

CYCLIC_WAKEUP

•

FAULT/WAKEUP tone

•

CYCLIC_WAKEUP tone

FSM transition

NORMAL

VIF frames

Functional operations

For the FAULT/WAKEUP tone, see Section 5.8.3.8 and for the CYCLIC_WAKEUP tone, see Section 5.8.3.7.

The VIF transmitter is enabled according to the GENERAL_REG.ISO_TX_EN configuration bit and to the device

state, as listed in the following table:

Table 32. VIF Transmitter (TX) Interface enable conditions

VIF_ID

FSM_STATE

ISO_TX_EN

ISO TX state

Note

Any

Disabled

Addressing procedure required (see

Section 5.8.1)

≠0

DEEPSLEEP

CYCLIC_COUNT

Disabled

CYCLIC_WAKEUP

Enabled

When device is in sender mode to send the

CYCLIC_WAKEUP tone

≠0

NORMAL

Disabled

≠0

NORMAL

Enabled (default at

POR_MAIN)

In a VIF port, both positive and negative terminals are biased to a VVIF_CM common mode voltage, and the

information is encoded in the differential signal by a proprietary protocol with the following logic, where each bit

lasts TVIF_BIT:

•

A negative to positive transition indicates a logic ‘0’

•

A positive to negative transition indicates a logic ‘1’

A VIF frame is normally composed of 40 bits. If it is a compressed frame (Compressed = 1) it may be longer than

40 bits, in this case the device decompress it and fill the RX FIFO with the corresponding 40-bit decompressed

frames.

Signals at the ISO port terminals are normally in the VVIF_CM ± (V5V/2) range, as shown in Figure 11 below.

L9965T/L9965TS

Functional description

DS14987 - Rev 1

page 31/62

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