Electronic Components Datasheet Search |
|
S-77101BXX-I8T1U4 Datasheet(PDF) 8 Page - Seiko Instruments Inc |
|
S-77101BXX-I8T1U4 Datasheet(HTML) 8 Page - Seiko Instruments Inc |
8 / 40 page POWER SEQUENCER S-77100/77101 Series Rev.1.0_01 8 Operation 1. Sequence operation 1. 1 S-77100A (Reverse type), S-77100B (Forward type) The S-77100 Series has enable outputs of 4 channels (the ENBL_A pin, the ENBL_B pin, the ENBL_C pin and the ENBL_D pin). The order of the off-sequence operation is different in reverse type and forward type. 1. 1. 1 Sequence operation outline (1) On-sequence operation After the ON pin changes from "L" to "H", the external capacitor (CDLY) charge operation is started, and the discharge operation is performed when CDLY is fully charged. The period during which this is repeated n times is the delay time (tDLY), and the ENBL_A pin changes to "H". Similarly, each time tDLY elapses, the ENBL_B pin, the ENBL_C pin and the ENBL_D pin change to "H" in turn. The period from when the ON pin changes from "L" to "H" to when the ENBL_D pin changes to "H" is called "on-sequence period". (2) Off-sequence operation After the ON pin changes from "H" to "L", CDLY charge operation is started, and the discharge operation is performed when CDLY is fully charged. The period during which this is repeated n times is tDLY, and the ENBL_D pin, the ENBL_C pin, the ENBL_B pin and the ENBL_A pin change to "L" in turn in S-77100A. The ENBL_A pin, the ENBL_B pin, the ENBL_C pin and the ENBL_D pin change to "L" in turn in S-77100B. The period from when the ON pin changes from "H" to "L" to when the ENBL_A pin in S-77100A or the ENBL_D pin in S-77100B changes to "L" is called "off-sequence period". Do not change the ON pin during on-sequence period and off-sequence period in order to perform the sequence operation normally. The number of times of CDLY charge and discharge which determines tDLY can be selected from 2 times / 4 times / 8 times / 16 times as the option. CDLY charge operation and discharge operation to generate tDLY are performed by the constant current circuit. Refer to " Relation between Delay Time and External Capacitor" for the relation of CDLY and tDLY. In addition, the period from when the ENBL_A pin, the ENBL_B pin, the ENBL_C pin and the ENBL_D pin all change to "H" to when the off-sequence operation starts is called "power-good period", and the period from when the ENBL_A pin, the ENBL_B pin, the ENBL_C pin and the ENBL_D pin all change to "L" to when the on-sequence operation starts is called "off period". Refer to Figure 5 for the peripheral circuit connection example. Timing charts are shown in Figure 6 and Figure 7 for S-77100A and S-77100B, respectively. IN EN OUT IN EN OUT IN EN OUT IN EN OUT S-77100 Series 0.1 F VDD VSS ON CDLY ENBL_A ENBL_B ENBL_C ENBL_D 5 V AUX DC-DC LDO DC-DC LDO DC-DC LDO DC-DC LDO DC-DC LDO IN OUT 3.3 V SoC I/O LOGIC MEMORY CORE 2.5 V 1.8 V 1.5 V 1.1 V Remark The ENBL_x pin is CMOS output. Figure 5 Peripheral Circuit Connection Example (S-77100A: Reverse type, S-77100B: Forward type) Caution 1. The input should be performed after the power supply voltage applied to the S-77100 Series becomes stable condition. 2. The above connection diagram does not guarantee successful operation. Perform thorough evaluation using the actual application to set the constant. |
Similar Part No. - S-77101BXX-I8T1U4 |
|
Similar Description - S-77101BXX-I8T1U4 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |