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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TPS658620ZQZT датащи(PDF) 74 Page - Texas Instruments |
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TPS658620ZQZT датащи(HTML) 74 Page - Texas Instruments |
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74 / 104 page  ALARM DETECTION LOGIC RTC RAM 40-BIT COUNTER (RAWRTCDATA) OUT32K XTAL1 XTAL2 Cg0 7pF Cg1 12pF Cd0 7pF Cd1 12pF VRTC_OUT EN 32KCLOCK SELECTION POR PRESCALER V32K INTERRUPT CONTROLLER SEQUENCER STANDARD I2CONLY ALARM1 ALARM2 I2C I2C RESET RTCRAM TPS658620 Advanced Power Management Unit SLVS993 – OCTOBER 2009 www.ti.com Figure 3-21. Simplified RTC Block The following functions are provided: • A 40-bit counter, driven by a low-power 32 kHz oscillator • The 32 kHz oscillator can be switched using I2C, RTC_CTRL Register bit 6 (OSC_SRC_SEL), between the TPS658620 internal (RC) oscillator source and the crystal driven oscillator source. • Externally biased buffer to supply the crystal driven oscillator to an external device via the OUT32K pin. • Selectable pre-scaler divides the raw (32KHz) oscillator output, enabling clocking the RTC counter at 1.024 kHz or 32 kHz • A 24-bit alarm register (ALARM1) • A 16-bit alarm register (ALARM2) The RTC registers are accessible only via the I2C bus. When an I2C read access is in progress, the RTC counter update is postponed. At the end of the I2C read access, the accumulated missing counts are added to the RTC counter. NOTE The RTC registers (0xC0-0xCA) ARE NOT reset when the TPS658620 is in the POWER DOWN or SLEEP STATE as long as V(RTC_OUT) is greater than VUVLO_RTC . All the RTC registers will be reset to their default settings, independent of the TPS658620 state, when V(RTC_OUT) is less than VUVLO_RTC. The host software must read all five RTC counter bytes when accessing the RTC counter data, as the counter update is postponed starting at the first I2C byte read of a sequential I2C read of the five RTC_COUNT bytes and negated on the fifth I2C byte read. To assure proper operation of the RTC counter the following steps should always be followed: 1. The I2C address pointer must not be left pointing in the range 0xC6 to 0xCA DETAILED DESCRIPTION 74 Submit Documentation Feedback |
Аналогичный номер детали - TPS658620ZQZT |
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Аналогичное описание - TPS658620ZQZT |
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