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HTRC11001 Datasheet(PDF) 7 Page - NXP Semiconductors |
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HTRC11001 Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 20 page 2001 Nov 23 7 Philips Semiconductors Product specification HITAG reader chip HTRC11001T 8.6 Idle and Power-down mode The HTRC11001T can be switched into the Idle mode via setting bit PD = 1 and resetting bit PD_MODE = 0 (see Table 3). In this Idle mode, only the oscillator and a few other system components are active. It is also possible to switch the HTRC11001T completely off. This is achieved by the Power-down mode (bit PD = 1 and bit PD_MODE = 1). Within this mode also the clock oscillator is switched off. This reduces the supply current of the HTRC11001T to less than 20 µA. 8.7 Serial interface The communication between the HTRC11001T and the microcontroller is done via a 3-wire digital interface. The interface is operated by the following signals: • Clock pulse on pin SCLK • Data input on pin DIN • Data output on pin DOUT. Pins SCLK and DIN are realized as Schmitt-trigger inputs. Pin DOUT is an open-drain output with an internal pull-up resistor. 8.7.1 COMMUNICATION PROTOCOL Every communication between the HTRC11001T and the microcontroller begins with an initialization of the serial interface. The interface initialization condition is a LOW-to-HIGH transition on pin DIN while pin SCLK is at HIGH level (see Fig.3). All commands transmitted to the HTRC11001T serial interface start with the Most Significant Bit (MSB). Input DIN and output DOUT are valid when pin SCLK is at HIGH level. 8.7.2 GLITCH FILTER Connecting pin MODE to VDD enables digital filtering of the SCLK and the DIN input signals. This mode offers improved immunity against noise and interference (glitches) on these interface signals. It is intended to be used in the so called ‘active antenna applications’ where the microcontroller and the reader communicate via long signal lines (e.g. 1 meter). In other applications pin MODE has to be connected to ground (pin VSS). For a detailed description of this feature, refer to the application note “AN 98080 Read/Write devices based on the HITAG Read/Write IC HTRC110”. handbook, full pagewidth MGW268 initialization SCLK DIN th tsu DOUT D7 D6 D1 D0 D7 D6 D1 D0 Fig.3 Serial interface communication protocol. |
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