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ST8034HN Fiches technique(PDF) 25 Page - STMicroelectronics

No de pièce ST8034HN
Description  24-pin smartcard interfaces
PDF  31 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST8034HN Fiches technique(HTML) 25 Page - STMicroelectronics

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ST8034HN, ST8034HC
Functional description
Time delays
t11 = t10 + 3T / 64
t12 = t11 + T / 2
t13 = t11 + T
t14 = t11 + 3T / 2
tDEACT = t11 + 3T / 2 + VCC fall time.
T = 64 x 1/fOSC(INT).
Figure 11. Deactivation sequence
6.9
VCC generator
The LDO on the VCC output is capable of supplying up to 65 mA continuously at any
selected VCC value (5 V, 3 V or 1.8 V). This output is overcurrent protected by the current
limiter with a limit threshold value of 120 mA typ., with a glitch immunity allowing overcurrent
pulses up to 200 mA with duration up to several microseconds not causing a deactivation
(the average current value must stay below the specified current limit, see Table 6 on
page 11 and Table 10 on page 17).
A 100 nF capacitor (min.) with ESR < 350 m
 should be tied to GND near the VCC pin and
another low ESR 100 nF capacitor (min.) should be tied to GND also on the card side, near
the card reader contact C1.



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