TDA8026ETSLASHC3 datasheet(13/61 Pages) NXP

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TDA8026_1

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Product data sheet

Rev. 1.1 — 30 June 2016

13 of 61

NXP Semiconductors

TDA8026

Multiple smart card slot interface IC

Remark: Refer to the Application note AN10724 for further information.

8.3.3 VDD(INTREGD) voltage supervisor without external divider on PORADJ pin

An alarm signal is triggered and the analog controller resets the TDA8026 when:

• VDD(INTREGD) is less than Vth on pin VDD(INTREGD)

• Pin PORADJ monitoring VDD(INTF) is less than Vth

The alarm is reset and the TDA8026 leaves reset mode 8 ms after VDD and VPORADJ are

above their respective Vth + Vhys.

Vth on VDD(INTF) is set as shown in Equation 1:

(1)

Thus Vbg = 1.21 V (see Figure 6).

In reset mode, the TDA8026 is inactive and does not respond to any external command

lines.

Fig 8.

VDD(INTF) voltage supervisor

001aal089

twake

Vth + Vhys

Vth

power-up

supply

drop

VDD(INTF)

VDD(INTREGD)

ALARMN

(internal signal)

device

ready for

activation

device

ready for

activation

bg 1

-------





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