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參數(shù)資料
| 型號(hào)： | BQ4285EQN |
| 廠(chǎng)商： | TEXAS INSTRUMENTS INC |
| 元件分類(lèi)： | XO, clock |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁(yè)數(shù)： | 25/30頁(yè) |
| 文件大小： | 1497K |
| 代理商： | BQ4285EQN |
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Functional Description
Address Map
The bq4285E/L provides 14 bytes of clock and con-
trol/status registers and 114 bytes of general nonvolatile
storage.
Figure 1 illustrates the address map for the
bq4285L.
Update Period
The update period for the bq4285E/L is one second. The
bq4285E/L updates the contents of the clock and calen-
dar locations during the update cycle at the end of each
update period (see Figure 2). The alarm flag bit may
also be set during the update cycle.
The bq4285E/L copies the local register updates into the
user buffer accessed by the host processor. Whena1is
written to the update transfer inhibit bit (UTI) in regis-
ter B, the user copy of the clock and calendar bytes re-
mains unchanged, while the local copy of the same bytes
continues to be updated every second.
The update-in-progress bit (UIP) in register A is set
tBUC time before the beginning of an update cycle (see
Figure 2). This bit is cleared and the update-complete
flag (UF) is set at the end of the update cycle.
4
Figure 1. Address Map
Figure 2. Update Period Timing and UIP
Jan. 1999 B
bq4285E/L
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| BU-61843F4-122L | 2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CQFP72 |
| BU-61843F4-142Q | 2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CQFP72 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BQ4285ES | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述: |
| BQ4285L | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Enhanced RTC With NVRAM Control |
| BQ4285LP | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:Enhanced RTC With NVRAM Control |
| BQ4285LQ | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述: |
| BQ4285LS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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