Rainbow-electronics DS28DG02 User Manual

1 of 33 REV: 061907 Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple r

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 10 of 33 PIO Direction ADDR b7 b6 b5 b4 b3 b2 b1 b0 122h DIR7 DIR6 DIR5

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 11 of 33 PIO Read Access ADDR b7 b6 b5 b4 b3 b2 b1 b0 126h IV7 IV6 IV5 I

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 12 of 33 RTC and Calendar Registers ADDR b7 b6 b5 b4 b3 b2 b1 b0 129h 0

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 13 of 33 Table 1. Alarm Frequency Control DY/DT AM4 AM3 AM2 AM1 ALAR

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 14 of 33 BIT DESCRIPTION BIT(S) DEFINITION RST: Reset Flag b0 RSTZ pi

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 15 of 33 MONITORING FUNCTIONS The DS28DG02 has two voltage monitors: one

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 16 of 33 In contrast to the VCC monitor, the battery monitor is active o

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 17 of 33 SPI INTERFACE The DS28DG02 is a slave device that communicates

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 18 of 33 Figure 9. SPI Timing, Mode (0,0) CSZSCKSISOHigh Impedance High

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 19 of 33 Principles of Operation The first byte that the DS28DG02 receiv

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 2 of 33 ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Gr

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 20 of 33 Figure 12. SPI Status Register ADDR b7 b6 b5 b4 b3 b2 b1 b0 N/

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 21 of 33 Figure 13. Write-Enable Timing 0 0 0 0 0 1 1 0 0 1 2 3 4 5 6 7

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 22 of 33 WRSR Write SPI Status Register The WRSR instruction is the only

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 23 of 33 Figure 16. Read SPI Status Register Timing 0 1 2 3 4 5 6 7 8 9

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 24 of 33 RFSH Refresh PIO Registers The volatile PIO-related registers f

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 25 of 33 is 1 AND the number if bits sent by the master is a multiple of

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 26 of 33 Figure 18. Single-Byte Write to Memory and PIO Timing CSZ S

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 27 of 33 Figure 19. Multiple-Byte Write to Memory and PIO Timing (contin

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 28 of 33 Figure 20. Read Memory and PIO Timing (continued) CSZ SCK

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 29 of 33 Figure 21. PIO Write Access Timing, Low-Current Mode This edge

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 3 of 33 PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS LOW-Level Input Vo

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 30 of 33 Reading from PIO When reading from PIOs, as shown in Figure 23,

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 31 of 33 Command-Specific Communication—Color Codes Master-to-Slave Slav

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 32 of 33 Figure 24. Crystal Placement on PCB Local ground plane beneath

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 33 of 33 Pin Configurations 2827262524232221201918171615VBAT CSZ SCK SI

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 4 of 33 PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS BATTERY MONITOR (S

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 5 of 33 PIN DESCRIPTION PIN NAME TSSOP28 TQFN36 FUNCTION X1 1 33 32.768

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 6 of 33 Figure 1. Block Diagram SPI Communication Interface 64-bit Uniq

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 7 of 33 Figure 2. Memory Map ADDRESS TYPE ACCESS DESCRIPTION 000h to

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 8 of 33 DETAILED REGISTER DESCRIPTIONS Power-On Default for PIO Output

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog 9 of 33 Power-On Default for PIO Read Inversion (PIO8 to PIO11), PIO Out