參數(shù)資料
型號： TDA8024
廠商： NXP Semiconductors N.V.
英文描述： ECONOLINE: RB & RA - Dual Output from a Single Input Rail- Power Sharing on Output- Industry Standard Pinout- 1kVDC & 2kVDC Isolation- Custom Solutions Available- UL94V-0 Package Material- Efficiency to 85%
中文描述： IC卡接口
文件頁數(shù)： 14/29頁
文件大?。?/td> 172K
代理商： TDA8024
2004 July 12
14
Philips Semiconductors
Product specification
IC card interface
TDA8024
8.9
V
CC
generator
The V
CC
generator has a capacity to supply up to 80 mA
continuously at 5 V and 65 mA at 3 V.
An internal overload detector operates at approximately
120 mA. Current samples to the detector are internally
filtered, allowing spurious current pulses up to 200 mA
with a duration in the order of
μ
s to be drawn by the card
without causing deactivation. The average current must
stay below the specified maximum current value.
For reasons of V
CC
voltage accuracy, a 100 nF capacitor
with an ESR < 100 m
should be tied to CGND near to
pin V
CC
, and a 100 or 220 nF capacitor (220 nF is the best
choice) with the same ESR should be tied to CGND near
card reader contact C1.
8.10
Fault detection
The following fault conditions are monitored:
Short-circuit or high current on V
CC
Removal of a card during a transaction
V
DD
dropping
DC/DC converter operating out of the specified values
(V
DDP
too low or current from V
UP
too high)
Overheating.
There are two different cases (see Fig.10):
CMDVCC HIGH outside a card session.
Output OFF
is LOW if a card is not in the card reader, and HIGH if a
card is in the reader. A voltage drop on the V
DD
supply
is detected by the supply supervisor, this generates an
internal Power-on reset pulse but does not act upon
OFF. No short-circuit or overheating is detected
because the card is not powered-up.
CMDVCC LOW within a card session.
Output OFF
goes LOW when a fault condition is detected. As soon
as this occurs, an emergency deactivation is performed
automatically (see Fig.11). When the system controller
resets CMDVCC to HIGH it may sense the OFF level
again after completing the deactivation sequence. This
distinguishes between a hardware problem or a card
extraction (OFF goes HIGH again if a card is present).
Depending on the type of card-present switch within the
connector (normally-closed or normally-open) and on the
mechanical characteristics of the switch, bouncing may
occur on the PRES signals at card insertion or withdrawal.
There is a debounce feature in the device with an 8 ms
typical duration (see Fig.10). When a card is inserted,
output OFF goes HIGH only at the end of the debounce
time.
When the card is extracted, an automatic deactivation
sequence of the card is performed on the first true/false
transition on PRES or PRES and output OFF goes LOW.
handbook, full pagewidth
MDB059
OFF
CMDVCC
PRES
VCC
debounce
deactivation caused by
cards withdrawal
deactivation caused by
short-circuit
debounce
Fig.10 Behaviour of OFF, CMDVCC, PRES and V
CC
.
See “Application note AN10141”for software decision algorithm on OFF signal.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA8024AT 制造商:NXP Semiconductors 功能描述: 制造商:PHILIPS-SEMI 功能描述:
TDA8024AT/C1,112 功能描述:輸入/輸出控制器接口集成電路 IOCTRL 5V 1.5A 0.56W RoHS:否 制造商:Silicon Labs 產(chǎn)品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray
TDA8024AT/C1,118 功能描述:功率放大器 IC Card Interface 28-Pin RoHS:否 制造商:TriQuint Semiconductor 封裝 / 箱體: 工作電源電壓:28 V 電源電流:2.5 A 工作溫度范圍: 封裝:
TDA8024T 制造商:NXP Semiconductors 功能描述:
TDA8024T/C1 制造商:NXP Semiconductors 功能描述:
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