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DS1338 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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DS1338 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 16 page DS1338 I 2C RTC with 56-Byte NV RAM 10 of 16 whenever the seconds register is written. Write transfers occur on the acknowledge from the DS1338. Once the countdown chain is reset, to avoid rollover issues the remaining time and date registers must be written within 1 second. The 1Hz square-wave output, if enabled, transitions high 500ms after the seconds data transfer, provided the oscillator is already running. The DS1338 runs in either 12-hour or 24-hour mode. Bit 6 of the hours register is defined as the 12-hour or 24-hour mode-select bit. When high, the 12-hour mode is selected. In the 12-hour mode, bit 5 is the AM/PM bit, with logic high being PM. In the 24-hour mode, bit 5 is the 20-hour bit (20–23 hours). If the 12/ 24-hour mode select is changed, the hours register must be re-initialized to the new format. On an I 2C START, the current time is transferred to a second set of registers. The time information is read from these secondary registers, while the clock continues to run. This eliminates the need to re-read the registers in case of an update of the main registers during a read. Table 3. RTC and RAM Address Map ADDRESS BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 FUNCTION RANGE 00H CH 10 Seconds Seconds Seconds 00–59 01H 0 10 Minutes Minutes Minutes 00–59 02H 0 12/ 24 AM/PM 10 Hour Hour Hours 1–12 +AM/PM 00–23 20 Hour 03H 0 0 0 0 0 Day Day 1–7 04H 0 0 10 Date Date Date 01–31 05H 0 0 0 10 Month Month Month 01–12 06H 10 Year Year Year 00–99 07H OUT 0 OSF SQWE 0 0 RS1 RS0 Control 08H–3FH RAM 56 x 8 00H–FFH Note: Bits listed as “0” always read as a 0. |
Similar Part No. - DS1338_11 |
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Similar Description - DS1338_11 |
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