Table of contents
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ETM50E-07 Seiko Epson Corporation 4
Table of contents
ETM50E Revision History .................................................................................................. 2
Table of contents ............................................................................................................... 4
1. Overview ........................................................................................................................ 6
2. Block Diagram ............................................................................................................... 6
3. Terminal description ....................................................................................................... 7
3.1. Terminal connections ........................................................................................................................ 7
3.2. Pin Functions .................................................................................................................................... 7
4. Examples of external connection ................................................................................... 8
4.1. Examples of power supply connection .............................................................................................. 8
5. External Dimensions / Marking Layout ........................................................................... 9
6. Absolute Maximum Ratings ......................................................................................... 10
7. Recommended Operating Conditions .......................................................................... 10
8. Frequency Characteristics ........................................................................................... 10
9. Electrical Characteristics ............................................................................................. 11
10. Interface timing when power is turned ON / OFF ........................................................ 15
10.1. Restrictions of I
2
C-Bus interface in the initial power on................................................................. 15
10.2. Precautions for power ON / OFF .................................................................................................. 15
10.3 V
DD
ON / OFF when using power switching (INIEN = 1) ................................................................ 16
10.4 V
DD
ON / OFF when power switching is not used (INIEN = 0) ....................................................... 16
11. Reference Information................................................................................................ 17
12. Application Notes ....................................................................................................... 18
13. Overview of Functions and Registers ......................................................................... 19
13.1. Overview of Functions .................................................................................................................. 19
13.2. Register Table .............................................................................................................................. 20
13.2.1. Register Table ................................................................................................................ 20
13.2.2. Register initial value and Read/Write operation Table .................................................... 21
13.3. Description of registers ................................................................................................................. 22
13.3.1. Clock and calendar registers (0h ~ 16h) ......................................................................... 22
13.3.2. RAM registers (20h ~ 23h) ............................................................................................. 22
13.3.3. Alarm registers (17h ~ 19h) ............................................................................................ 22
13.3.4. Timer setting and Timer counter register for wakeup timer (1Ah ~ 1Eh) ........................ 22
13.3.5. Function-related register 1 (1Ch ~ 1Eh) ......................................................................... 22
13.3.6. Function-related register 2 (1Fh) ................................................................................. 23
13.3.7. Digital offset register (30h) .......................................................................................... 23
14. Functions ................................................................................................................... 24
14.1. Clock calendar explanation ........................................................................................................... 24
14.1.1. Clock counter.................................................................................................................. 24
14.1.2. Week counter ................................................................................................................. 25
14.1.3. Calendar counter ............................................................................................................ 25
14.2. Wakeup Timer Interrupt Function ................................................................................................. 26
14.2.1. Related registers for function of wakeup timer interrupt function .................................... 26
14.2.2. Wakeup timer start timing ............................................................................................... 29
14.2.3. Wakeup timer interrupt interval (example) ...................................................................... 30
14.2.4. Diagram of wakeup timer interrupt function .................................................................... 30
14.3. Alarm Interrupt Function ............................................................................................................... 32
14.3.1. Related registers for Alarm interrupt functions................................................................ 32
14.3.2. Examples of alarm settings ............................................................................................ 33
14.4. Time Update Interrupt Function .................................................................................................... 35
14.4.1. Related registers for time update interrupt functions. ..................................................... 35
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