NCN6001_14 Datasheet, PDF (21/33 Pages) ON Semiconductor – Compact Smart Card Interface IC

NCN6001
Protocol: Special Mode
Protocol: Standard SPI
Figure 15. MISO Read Out Sequences
DC/DC OPERATION
The power conversion is based on a full bridge structure
capable to handle either step up or step down power supply
(Figure 16). The operation is fully automatic and, beside the
output voltage programming, does not need any further
adjustments.
CMD_1.8V
CMD_3.0V
CMD_5.0V
CMD_STOP
10 mF C1
GND
G_Q1
G_Q3
G_HIZ
G_Q4
G_Q2
G_Q7
V_CC
6
Q1
10
Q3
CRD_VCC
13
L1
12
22 mH
Q5
Q6
Q7 ^{C2 10 mF}
Q2
GND
Q4
GND
11 PWR_GND
GND
Figure 16. Basic DC/DC Converter
In order to achieve the 250 ms max time to discharge
CRD_VCC to 400 mV called by the EMV specifications, an
active pull down NMOS is provided (Q7) to discharge the
external CRD_VCC reservoir capacitor. This timing is
guaranteed for a 10 mF maximum load reservoir capacitor
value (Figure 4).
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