ISO7841F datasheet(20/31 Pages) TI

20 / 31 page

ISO7841, ISO7841F

SLLSEM3C – NOVEMBER 2014 – REVISED JULY 2015

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8.4 Device Functional Modes

ISO7841 functional modes are shown in Table 1.

Table 1. Function Table(1)

OUTPUT

INPUT

OUTPUT

VCCI

VCCO

ENABLE

COMMENTS

(INx)(2)

(OUTx)

(ENx)

H or open

Normal Operation:

A channel output assumes the logic state of its input.

H or open

Default mode: When INx is open, the corresponding channel output

Open

H or open

Default

goes to its default logic state. Default= High for ISO7841 and Low for

ISO7841F.

A low value of Output Enable causes the outputs to be high-

impedance

Default mode: When VCCI is unpowered, a channel output assumes

the logic state based on the selected default option. Default= High for

ISO7841 and Low for ISO7841F.

H or open

Default

When VCCI transitions from unpowered to powered-up, a channel

output assumes the logic state of its input.

When VCCI transitions from powered-up to unpowered, channel output

assumes the selected default state.

When VCCO is unpowered, a channel output is undetermined

(3).

Undetermined

When VCCO transitions from unpowered to powered-up, a channel

output assumes the logic state of its input

(1)

VCCI = Input-side VCC; VCCO = Output-side VCC; PU = Powered up (VCC ≥ 2.25 V); PD = Powered down (VCC ≤ 1.7 V); X = Irrelevant; H

= High level; L = Low level ; Z = High Impedance

(2)

A strongly driven input signal can weakly power the floating VCC via an internal protection diode and cause undetermined output.

(3)

The outputs are in undetermined state when 1.7 V < VCCI, VCCO < 2.25 V.

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