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TDA8020HLC1 Datasheet(PDF) 8 Page - NXP Semiconductors |
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TDA8020HLC1 Datasheet(HTML) 8 Page - NXP Semiconductors |
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8 / 28 page  2003 Nov 06 8 Philips Semiconductors Product specification Dual IC card interface TDA8020HL DC-to-DC converter VCC1 is the supply voltage for card 1 contacts and VCC2 is the supply voltage for card 2 contacts. Card 1 and card 2 may be independently powered-down, powered at 5 V or powered at 3 V. A capacitor type step-up converter is used for generating these voltages. This step-up converter acts either as a doubler, tripler or follower. An hysteresis of 100 mV is present on the different threshold voltages. If VCC is the maximum value of VCC1 and VCC2, then there are 5 possible situations: • VDD < 3.4 V and VCC = 3 V: in this case, the DC-to-DC converter acts as a doubler with a regulation of approximately 4.0 V • VDD < 3.4 V and VCC = 5 V: in this case, the DC-to-DC converter acts as a tripler with a regulation of approximately 5.5 V • VDD > 3.5 V and VCC = 3 V: in this case, the DC-to-DC converter acts as a follower: VDD is applied on VUP • 5.8V>VDD > 3.5 V and VCC = 5 V: in this case, the DC-to-DC converter acts as a doubler with a regulation of approximately 5.5 V • VDD > 5.9 V and VCC = 5 V: in this case, the DC-to-DC converter acts as a follower and VDD is applied on VUP. The output voltage, VUP, is fed internally to the VCC generators. VCC1,VCC2 and CGND1, CGND2 are used as a reference for all other cards contacts. The sum of ICC1 and ICC2 shall not exceed 80 mA, which means that when a card is drawing its maximum current (around 60 mA at VCC = 5 V, 55 mA at VCC = 3 V), the other card should be set in low power consumption mode (less than 20 or 25 mA). Note that during the card Advice to Receive (ATR) process, the current may be maximum; so, a card should only be activated if the other card draws less than 20 or 25 mA. The DC-to-DC converter is supplied via separate supply pins VDDA and AGND to allow decoupling separate from the other supply pins. During normal operation or activation, each card is allowed to draw independently a current of up to 60 mA at VCC = 5 V or up to 55 mA at VCC = 3 V, with a supply voltage from 2.7 V up to 6.5 V provided the sum of ICC1 and ICC2 does not exceed 80 mA. If VDD > 3 V, for 5 V cards, then both cards can draw up to 60 mA at the same time. If VDD > 3 V, for 3 V cards, then both cards can draw up to 55 mA at the same time. I2C-bus A 400 kHz I2C-bus slave interface is used for configuring the device and reading the status. I2C-BUS PROTOCOL The I2C-bus is for 2-way, 2-line communication between different ICs or modules. The serial bus consists of two bidirectional lines; one for data (SDA), and one for the clock (SCL). Both the SDA and SCL lines must be connected to a positive supply voltage via a pull-up resistor. The following protocol has been defined: • Data transfer may be initiated only when the bus is not busy • During data transfer, the data line must remain stable whenever the clock line is HIGH. Changes in the data line while the clock line is HIGH will be interpreted as control signals. BUS CONDITIONS The following bus conditions have been defined: • Bus not busy: both data and clock lines remain HIGH • Start data transfer: a change in the state of the data line, from HIGH-to-LOW, while the clock is HIGH, defines the START condition • Stop data transfer: a change in the state of the data line, from LOW-to-HIGH, while the clock is HIGH, defines the STOP condition • Data valid: the state of the data line represents valid data when, after a START condition, the data line is stable for the duration of the HIGH period of the clock signal. There is one clock pulse per data bit. DATA TRANSFER Each data transfer is initiated with a START condition and terminated with a STOP condition. Data transfer is unlimited in the read mode. The information is transmitted in bytes and each receiver acknowledges with a ninth bit. The TDA8020HL operates in standard mode (100 kHz clock rate) and fast mode (400 kHz clock rate) defined in the I2C-bus specification. By definition, a device that sends a signal is called a transmitter, and the device which receives the signal is called a receiver. The device which controls the signal is |
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Similar Description - TDA8020HLC1 |
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