mc33560 ON Semiconductor, mc33560 Datasheet - Page 20

• Manufacturer Part Number: mc33560
• Description: Power Management And Interface Ic For Smartcard Readers And Couplers
• Manufacturer: ON Semiconductor

poll with PWRON = L −> RDYMOD = H:
RDYMOD
CRDVCC
CRDDET
PWRON
Figure 28. Card Signal Sequence During V
INT
CS
card inserted
card present
CRDV
CS = L, PWRON = H
−> RDYMOD = L
CC
undervoltage
t
t
drdy
fltin
t
dres
RDYMOD = H
http://onsemi.com
MCU polls
(glitch not to scale)
MC33560
smaller than t
overload time
t
greater than t
dres
converter stop and
CRDV
CC
20
overload time
Overload and Unexpected Card Extraction
CC
pulldown
dres
V
35 ns typ
V
dres
TxL
TxH
RDYMOD = H: card still present
−>
poll with PWRON = L −>
poll with PWRON = H −> RDYMOD = L:
DC−DC converter overload
MCU deactivates PWRON
after card extraction
card extraction
t
fltout