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參數(shù)資料
| 型號： | DS8313-RRX+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 4/18頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC INTERFACE SMART CARD 28-SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 243 |
| 應(yīng)用： | 智能卡 |
| 接口： | 模擬 |
| 電源電壓： | 2.7 V ~ 6 V |
| 封裝/外殼： | 28-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SOIC W |
| 包裝： | 管件 |
| 安裝類型： | 表面貼裝 |
DS8313/DS8314
Deactivation Sequence
When a session is completed, the host microcontroller
sets the CMDVCC line high to execute an automatic
deactivation sequence and returns the card interface to
the inactive mode (Figure 5).
1) RST goes low (t10).
2) CLK is held low (t12 = t10 + 0.5
× T) where T is 64
times the period of the internal oscillator (approxi-
mately 25s).
3) I/O pin is pulled low (t13 = t10 + T).
4) VCC starts to fall (t14 = t10 + 1.5
× T).
5) When VCC reaches its inactive state, the deactiva-
tion sequence is complete (at tDE).
6) All card contacts become low impedance to GND;
I/OIN remains at VDD (pulled up through an 11k
Ω
resistor).
7) The internal oscillator returns to its lower frequency.
VCC Generator
The VCC generator has a capacity to supply up to
80mA continuously at 5V, 65mA at 3V, and 30mA at
1.8V. An internal overload detector triggers at approxi-
mately 120mA. Current samples to the detector are fil-
tered. This allows spurious current pulses (with a
duration of a few s) up to 200mA to be drawn without
causing deactivation. The average current must stay
below the specified maximum current value. To main-
tain VCC voltage accuracy, a 100nF capacitor (with an
ESR < 100m
Ω) should be connected to CGND and
placed near the VCC pin, and a 100nF or 220nF capaci-
tor (220nF is the best choice) with the same ESR should
be connected to CGND and placed near the smart
card reader’s C1 contact.
Fault Detection
The following fault conditions are monitored:
Short-circuit or high current on VCC
Removal of a card during a transaction
VDD dropping
Card voltage generator operating out of the speci-
fied values (VDDA too low or current consumption
too high)
Overheating
There are two different cases (Figure 6):
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. The VDD supply is
monitored—a decrease in input voltage generates
an internal power-on reset pulse but does not
affect the OFF signal. Short-circuit and tempera-
ture detection is disabled because the card is not
powered up.
CMDVCC Low Within a Card Session. Output
OFF goes low when a fault condition is detected,
and an emergency deactivation is performed auto-
matically (Figure 7). When the system controller
resets CMDVCC to high, it may sense the OFF
level again after completing the deactivation
sequence. This distinguishes between a card
extraction and a hardware problem (OFF goes high
again if a card is present). Depending on the con-
nector’s card-present switch (normally closed or
normally open) and the mechanical characteristics
of the switch, bouncing can occur on the PRES sig-
nals at card insertion or withdrawal.
The DS8313/DS8314 have a debounce feature with an
8ms typical duration (Figure 6). When a card is insert-
ed, output OFF goes high after the debounce time
delay. When the card is extracted, an automatic deacti-
vation sequence of the card is performed on the first
true/false transition on PRES and output OFF goes low.
Smart Card Interface
12
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS8313-RRX+ | 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 |
| DS8314 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Smart Card Interface |
| DS8314L-RRX+ | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Smart Card Interface |
| DS8314-RRX+ | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Smart Card Interface |
| DS833 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
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