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TLE9844-2QX Datasheet(PDF) 29 Page - Infineon Technologies AG |
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TLE9844-2QX Datasheet(HTML) 29 Page - Infineon Technologies AG |
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29 / 128 page  TLE9844-2QX System Control Unit - Digital Modules (SCU-DM) Data Sheet 29 Rev. 1.0, 2016-05-06 6.3 Clock Generation Unit The Clock Generation Unit (CGU) provides a flexible clock generation for TLE9844-2QX. During user program execution the frequency can be programmed for an optimal ratio between performance and power consumption. Therefore the power consumption can be adapted to the actual application state. The CGU in the TLE9844-2QX consists of one oscillator circuit (OSC_HP), a Phase-Locked Loop (PLL) module including an internal oscillator (OSC_PLL) and a Clock Control Unit (CCU). The CGU can convert a low-frequency input/external clock signal to a high-frequency internal clock. The system clock f SYS is generated out of the following selectable clocks: • PLL clock output f PLL • Direct clock from oscillator OSC_HP f OSC • Direct output of internal Oscillator f INTOSC • Low precision clock f LP_CLK (HW-enabled for startup after reset and during power-down wake-up sequence) The following sections describe the different parts of the CGU. 6.3.1 Low Precision Clock The clock source LP_CLK is a low-precision RC oscillator (LP-OSC, see f LP_CLK) that is enabled by hardware as an independent clock source for the TLE9844-2QX startup after reset and during the power-down wake-up sequence. There is no user configuration possible on f LP_CLK. 6.3.2 High Precision Oscillator Circuit (OSC_HP) The high precision oscillator circuit, designed to work with both an external crystal oscillator or an external stable clock source, consists of an inverting amplifier with XTAL1 as input, and XTAL2 as output. Figure 11 shows the recommended external circuitries for both operating modes, External Crystal Mode and External Input Clock Mode. 6.3.2.1 External Input Clock Mode When supplying the clock signal directly, not using an external crystal and bypassing the oscillator, the input frequency needs to be within the range of 4 MHz to 24 MHz if the PLL VCO part is used. When using an external clock signal it must be connected to XTAL1. XTAL2 is left open (unconnected). 6.3.2.2 External Crystal Mode When using an external crystal, its frequency can be within the range of 4 MHz to 6 MHz. An external oscillator load circuitry must be used, connected to both pins, XTAL1 and XTAL2. It consists normally of the two load capacitances C1 and C2, for some crystals a series damping resistor might be necessary. The exact values and related operating range are dependent on the crystal and have to be determined and optimized together with the crystal vendor using the negative resistance method. As starting point for the evaluation, the following load cap values may be used: Table 5 External CAP Capacitors Fundamental Mode Crystal Frequency (approx., MHz) Load Caps C 1, C2 (pF) 433 522 618 |
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