tda8035hn NXP Semiconductors, tda8035hn Datasheet - Page 8

• Manufacturer Part Number: tda8035hn
• Description: Smart Card Interface
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA8035HN
Product data sheet
8.2 Voltage supervisor
The voltage supervisor is used as a power on reset, and also as supply drop detection
during a card session. The threshold of the voltage supervisor is set internally in the IC for
V
As long as V
the levels on the command lines are. This also lasts for the duration of tw after V
reached a level higher than Vth(V
V
TDA8035. This defined reset pulse of approximately 5.7 ms (tw=2048 × 1/(fosc(int)_Low)
is used internally for maintaining the IC in a inactive mode during the supply voltage
power-on; (see following pictures). When V
DD(INTF)
is performed.
Fig 3.
DDP
DD(INTF)
and V
falls below Vthextf or when V
supervisors are combined and sent to a digital controller in order to reset the
Block voltage supervisor
REG
REG
whereas it can be adjusted externally for V
All information provided in this document is subject to legal disclaimers.
is less than Vth(V
VDD(INTF)
VDDP
Vreg
Poradj
Rev. 1.0 — 19 April 2011
Deep_shutdown
REG
REG
DDP
) + Vhys(V
) + Vhys(V
falls below Vth(VDDP) , a deactivation sequence
REG
falls below Vth(V
REG
REG
vbg
vbg
vbg
).The outputs of the V
), the IC will remain inactive whatever
DD(INTF)
vreg
TDA8035HN
REG
001aan747
using the PORADJ pin.
Smart card interface
) or when V
© NXP B.V. 2011. All rights reserved.
DDP,
V
REG
REG
and
8 of 32
has