BQ4285 datasheet(4/29 Pages) TI1

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BQ4285 Datasheet(PDF) 4 Page - Texas Instruments

Part #	BQ4285

Description	Real-Time Clock (RTC) With NVRAM Control

Download	29 Pages

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Manufacturer	TI1 [Texas Instruments]

Direct Link	http://www.ti.com

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4 / 29 page

Functional Description

Address Map

The bq4285 provides 14 bytes of clock and control/status

registers and 114 bytes of general nonvolatile storage.

Figure 1 illustrates the address map for the bq4285.

Update Period

The update period for the bq4285 is one second. The

bq4285 updates the contents of the clock and calendar

locations during the update cycle at the end of each up-

date period (see Figure 2). The alarm flag bit may also

be set during the update cycle.

The bq4285 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.

Figure 1. Address Map

Figure 2. Update Period Timing and UIP

bq4285

Manufacturer	Part #	Datasheet	Description
Texas Instruments	BQ4285	1Mb / 27P	[Old version datasheet] Real-Time Clock RTC With NVRAM Control
	BQ4285E	1Mb / 32P	[Old version datasheet] Enhanced RTC With NVRAM Control
	BQ4285E	1Mb / 31P	[Old version datasheet] Enhanced RTC With NVRAM Control
	BQ4285EP	1Mb / 32P	[Old version datasheet] Enhanced RTC With NVRAM Control
	BQ4285EP	1Mb / 31P	[Old version datasheet] Enhanced RTC With NVRAM Control

Manufacturer	Part #	Datasheet	Description
Texas Instruments	BQ4285	1Mb / 27P	[Old version datasheet] Real-Time Clock RTC With NVRAM Control
	BQ4287	142Kb / 8P	[Old version datasheet] Real-Time Clock Module With NVRAM Control
	BQ4287MT-SB2	376Kb / 10P	[Old version datasheet] Real-Time Clock Module With NVRAM Control
STMicroelectronics	M41T56	483Kb / 27P	Serial real-time clock (RTC) with 56 bytes NVRAM
STMicroelectronics	M41T11	231Kb / 30P	Serial real-time clock (RTC) with 56 bytes of NVRAM
Texas Instruments	BQ3285	553Kb / 22P	[Old version datasheet] Real-Time Clock RTC
National Semiconductor ...	DP8573A	270Kb / 16P	Real Time Clock (RTC)
Texas Instruments	BQ3285E	1Mb / 29P	[Old version datasheet] Real-Time Clock RTC
	BQ3285E	1Mb / 36P	[Old version datasheet] Real-Time Clock (RTC)
	BQ32000	513Kb / 20P	[Old version datasheet] REAL-TIME CLOCK (RTC)

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