参数资料
| 型号： | MC33560DW |
| 厂商： | ON Semiconductor |
| 文件页数： | 6/26页 |
| 文件大小： | 0K |
| 描述： | OC PWR MGMT READERS/CPLR 24-SOIC |
| 产品变化通告： | Product Obsolescence 11/Feb/2009 |
| 标准包装： | 30 |
| 系列： | * |
| 应用： | * |
| 接口： | * |
| 电源电压： | * |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
MC33560
http://onsemi.com
14
The card detector has an internal 50
ms debouncing delay.
The micro controller has to insert an additional delay (in the
ms range) to allow the card contacts to stabilize in the card
connector before setting PWRON = H.
When the card detector circuit detects a card extraction, it
activates the powerdown sequence and stops the converter,
regardless of the PWRON signal. The 50
ms delay of the
debouncer is enough to ensure that all card signals have
reached a safe value before communication with the card
takes place.
CARD STATUS
The controlling microprocessor is informed of the
MC33560 status by interrupt and by polling. When a card is
extracted or inserted, the INT line is asserted low. The
interrupt is cleared upon the rising edge of CS or upon the
rising edge of PWRON (INT line set to high state).
The microprocessor can poll the status at any time by
reading the RDYMOD pin with proper PWRON setting
Since INT and RDYMOD have a high value pullup
resistor (240 k
W typical), their rise time can be as long as
10
ms if parasitic capacitance is high and no other pullup
circuitry is connected.
POWER MANAGER
The task of the power manager is to activate only those
circuit functions which are needed for a determined operating
mode in order to minimize power consumption (Figure 19).
In standby mode (PWRON = L) the power manager keeps
only the “card present” detector alive. All card interface pins
are forced to ground potential.
In the event of a powerup request from the microcontroller
(
PWRON L to H transition, CS = L) the power manager
starts the DCDC converter. As soon as the CRDVCC
supply reaches the operating voltage range, the circuit
activates the card signals in the following sequence:
CRDVCC, CRDIO, CRDCLK, CRDC4/C8, CRDRST
At the end of the transaction (PWRON reset to L, CS = L)
or forced card extraction, the CRDVCC supply powers
down and the card signal deactivation sequence takes place:
CRDRST, CRDC4/C8, CRDCLK, CRDIO, CRDVCC
When CS = L, the bidirectional signal lines (I/O, C4 and
C8) are put into high impedance state to avoid signal
collision with the microcontroller in transmission mode.
BATTERY UNDERVOLTAGE DETECTOR
The task of this block is to monitor the supply voltage, and
to allow operation of the DCDC converter only with valid
voltage (typically 1.5 V). The comparator has been designed
to have stability better than 20 mV in the temperature range.
DCDC CONVERTER
Upon request from the power manager, the DCDC
converter generates the CRDVCC supply for the smartcard.
The output voltage is programmable for 3.0 V or 5.0 V (see
Table 3) to guarantee full cross compatibility of the reader
for 5.0 V and 3.0 V smartcards. The wide voltage supply
range, 1.8 V < VBAT < 6.6 V, accommodates a broad range
of coupler applications with different battery configurations
(single cell or multiple cells, serial or parallel connections).
The CRDVCC is currentlimited and shortcircuitproof.
To avoid excessive battery loading during a card
shortcircuit, a current integration function forces the
powerdown sequence (Figure 28). To retry the session, the
microprocessor works through the power on sequence as
defined in the power manager section.
DCDC CONVERTER OPERATING PRINCIPLES
The DCDC converter architecture used in the MC33560
allows stepup and stepdown voltage conversion to be
done. The unique regulation architecture permits an
automatic transition from stepup to stepdown, and from
zero to full load, without affecting the output characteristics.
DCDC
Converter
Description:
The
converter
architecture is very similar to the boost architecture, with an
active rectifier in place of the diode. The switching transistor
is connected to ground through a resistor network in order to
adjust the maximum peak current (Figure 22). A transistor
connected to the converter output (CRDVCC) forces this pin
to a low voltage when the converter is not operating. This
prevents erratic voltage supply to the smartcard when not
in use.
The MC33560 has a built in oscillator; the DCDC
converter requires only one inductor and the output filtering
capacitor to operate.
Stepup Operation: When the card supply voltage is
lower than the battery voltage, the converter operates like a
boost converter; the active rectifier behavior is similar to
that of a diode.
Stepdown Operation: When the card supply voltage is
higher than the battery voltage, the rectifier control circuit
puts the power rectifying transistor in conduction when the
L1 voltage reaches VBAT + VFSAT22. The voltage across the
rectifying transistor is higher than in stepup operation. The
efficiency is lower, and similar to a linear regulator.
Fault Detection: The DCDC converter has several
features that help to avoid electrical overstress of the
MC33560 and of the smartcard, and help to ensure that data
transmission with the smartcard occurs only when its supply
voltage is within predetermined limits. These functions are:
Overtemperature Detection,
Current Limitation, and
Card Supply Undervoltage Detection.
The level at which current will be limited is defined by the
maximum card supply current programmed with the
external components L1 and RLIM.
The undervoltage detection levels for 3.0 V and 5.0 V card
supply are preset internally to the MC33560.
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相关代理商/技术参数 |
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| MC33560DWR2 | 功能描述:输入/输出控制器接口集成电路 3V/5V Smartcard RoHS:否 制造商:Silicon Labs 产品: 输入/输出端数量: 工作电源电压: 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-64 封装:Tray |
| MC33560DWR2G | 功能描述:输入/输出控制器接口集成电路 3V/5V Smartcard Power Management RoHS:否 制造商:Silicon Labs 产品: 输入/输出端数量: 工作电源电压: 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-64 封装:Tray |
| MC33565D | 功能描述:低压差稳压器 - LDO 3.3V 200mA w/Sleep RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MC33565DG | 功能描述:低压差稳压器 - LDO 3.3V 200mA w/Sleep And Active Mode RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MC33565DMR2 | 功能描述:低压差稳压器 - LDO 3.3V 200mA w/Sleep RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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