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參數(shù)資料
| 型號(hào)： | TDA8030HL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | USB smart card reader (OTP or ROM) |
| 中文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-314-2, LQFP-64 |
| 文件頁數(shù)： | 30/57頁 |
| 文件大?。?/td> | 228K |
| 代理商： | TDA8030HL |
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2003 Jul 04
30
Philips Semiconductors
Product specification
USB smart card reader (OTP or ROM)
TDA8030; TDA8031
8.2.4
S
UPPLY SUPERVISOR
The switched supply voltage (V
DD
) is surveyed by a
voltage supervisor, to ensure proper Power-on reset when
the reader is plugged into the USB-bus, to maintain all
cards contacts inactive during power-on and also to
enforce an emergency deactivation sequence in case of
V
DD
drop-out or when the reader is unplugged from the
USB-bus.
The voltage supervisor generates an alarm pulse, whose
length is defined by an external capacitor tied to the
CDELAY pin, when V
DD
is too low to ensure proper
operation (1 ms per 2 nF typical).
This pulse is used as a Power-on reset pulse and also to
either block any spurious spikes on card contacts during
microcontrollers reset, or to force an automatic
deactivation of the contacts in the event of supply
drop-out; see Sections 8.3.3 and 8.3.4.
After power-on, or after a voltage drop, bit SUPL is set
within the Hardware Status Register (HSR) and remains
set until HSR is readout outside the alarm pulse. As long
as the Power-on reset is active, INT0 is LOW.
The same events occurs when the RESET pin has been
set active; the RESET pin should be set HIGH for a
minimum of 100
μ
s for a proper reset.
handbook, full pagewidth
CDELAY
Vth2
VDD
Vth1
tw
tw
tw
SUPL
INT0
status read
power-on
supply dropout
reset by pin RESET
power- off
RESET
MGU888
Fig.8 Voltage supervisor.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA8031 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:USB smart card reader (OTP or ROM) |
| TDA8031HL | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:USB smart card reader (OTP or ROM) |
| TDA8034AT | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Smart card interface |
| TDA8034AT/C1 | 制造商:NXP Semiconductors 功能描述:Cut Tape |
| TDA8034AT/C1,112 | 功能描述:接口 - 專用 SMART CARD INTERFACE RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:BGA-59 |
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