DS3234 水晶とSRAMを内蔵し、SPIバスの非常に正確なRTC

1 - 1/21 - Maxim 2011/10/919-5339; Rev 3; 7/10 Maxim Maxim Integrated Products,Inc. DS3234 SRAM SPI RTC DS3234 TCXO SPI (RTC) DS3234 VCC VCC VPF RST VCC VPF VBAT RST DS3234 300 20 SO DS3234 256 SRAM VBAT RTC 31 AM/PM 12 24 2 SPI GPS 2ppm(0 C +40 C)

2 (-40 C +85 C) 0 C +70 C -40 C +85 C 2099 2 4 MHz SPI 1 3 3 C RST 300 20 SO Underwriters Laboratories UL DS3234S#0 C +70 C20SO DS3234 SDS3234SN#-40 C +85 C20SO DS3234SN# RoHS RoHS JESD97 E3 "#" RoHS - 2/21 - 1 4 JEDEC JESD51-7

3 TA= -40 C +85 C 2 3 1 CS,SCLK,DIN + VCC + VCC + VCC= VCC= 1 TA= -40 C +85 C VCC= VBAT= TA= +25 C TCXO VCC VBAT 2 3 SCLK= 4 MHz VCC= ICCABSY = 0 A 4 5 VCC= = VIH 5 VCC= ICCS32kHz OFF ASQW OFF VCC= VCC= ICCSCONV32kHz OFF ASQW OFF VCC= 0 CS , SCLK , DIN , RSTSPI GND + - JA) ( 1) 55 C/W - JC) ( 1) 24 C/W -40 C +85 C +125 C -40 C +85 C 10 +260 C 2 +260 C.

4 - 3/21 - VVBAT IBATLKG25 100 nA VCC= TA= -40 C +85 C 2 3 1 32kHz(BB32kHz=1)IOH= -500 AVCC> -250 A > VCC> x VccVIOH= -125 > (VCCor VBAT) > 0 32kHzVOLIOL= V 1 DOUTVOHIOH= xVccV 0 VOLIOL= VDOUT , INT/SQW 0 RSTVOLIOL= V ILO -1 0+1 A32kHz , INT/SQW , DOUT ILI-1+1 ADIN , CS , SCLKRST I/O IOLRST 6 -200+10 ATCXO VCC= VBAT= TA=-40 C +85 C 2 3 fOUTVCC= VBAT= C +40 C-2+2 f/fOUT-40 C 0 + +40 C +85 C f/V1ppm/V-40 +25 f/LSBppm +70 +85 Temp-3+3 C f/fOUT ppm 0 10 VCC=0V VBAT= TA= -40 C +85 C 2 EOSC=0,BBSQW=0 VBAT= ACRATE1=CRATE0=0 VBAT= IBATTCEOSC=0.

5 BBSQW=0400 A IBATTDREOSC=1100 nAVCC= VBAT= 5 - 4/21 -AC VCC= TA= -40 C +85 C 2 VCC VCC SCLK tDC30nsSCLK Data tCDH30nsSCLK CS VCC Data 7 VCC VCC 110 SCLK Low VCC VCC 110 SCLK High VCC tR,tF200 nsCS SCLK VCC 100 SCLK CS VCC tCWH400nsCS tCDZ 8 40ns PBDB250ms tRST250ms OSF tOSF 9 100ms tCONV125 200 ms TA= -40 C +85 C VCC tVCCF300 sVPF MAX VPF MIN VCC tVCCR0 sVPF MIN VPF MAX tREC 10 125 300ms TA= +25 C CIN 11 10pF CIO 11 10pF- 5/21 - -SPI SPI -SPI SPI - 6/21 - 2 -40 C 3 GND 4 VIH= VIL= 10ns

6 DOUT= 5 CRATE1=CRATE0=0 6 RST VCC 50k 7 VOH= VOL= SCLK 50% DOUT VOH 8 50pF 9 tOSF 0V VCC VCC MAX VBAT VBAT MAX OSF 10 EOSC 1 tREC RST High 11 (VCC= + , TA= +25 C .) VCC V VBAT C ICCA DOUT C pF C - 7/21 - Low 1 CS 2 GND 32kHz 3 32kHz EN32kHz=0 BB32kHz=0 32kHz Low DC 4 VCC F F Low 0EH INTCN INTCN 0 5 INT/SQW RS2 RS1 INTCN 1 INT/SQW

7 INTCN 1 VCC Low VPF VCC VCC VPF RST Low VCC VPF tRST RST Low 6 RST VCC 50k tRST RST High 15 GND VBAT GND VBAT 16 VBAT UL SPI 17 DIN SPI 18 SCLK 20 CS Low SCLK 18 20 SPI CMOS 19 DOUT - 8/21 - DS3234 256 SRAM TCXO RTC DS3234 TCXO -40 C +85 C 2 RTC TCXO 32kHz RTC 2 INT/SQW

8 31 AM/PM 12 24 SPI VCC TCXO RST - 9/21 - DS3234 8 4 TCXO RTC 32kHz TCXO TCXO AGE AGE VCC 64 CRATE1 CRATE0 VCC VPF VCC VCC VPF VBAT VBAT VPF VCC VPF VCC VBAT VBAT VPF VCC VBAT VCC VBAT VCC VPF VBAT RST High 1 VBAT VCC VPF VCC VBAT DS3234 VBAT EOSC 1 RSTVCC< VPF, VCC< VBAT VBAT VCC< VPF, VCC> VBAT VCC VCC> VPF, VCC< VBAT VCC VCC> VPF.

9 VCC> VBAT VCC - 10/21 -VBAT VBAT VBAT IBATTC IBATT 3644 IBATTC IBATTDR EOSC=1 DS3234 RST DS3234 Low RST DS3234 RST Low PBDB DS3234 RST DS3234 DS3234 RST Low tRST Low RST VCC VPF RST Low VCC VPF RST TREC Low EOSC 1 tREC RST High RST 1 TCXO RTC SPI RST TCXO SPI RTC TCXO RTC 31 AM/PM 12 24 2 INT/SQW INTCN SRAMDS3234 256 VCC VPF VBAT SRAM - 11/21 - 1 DS3234

10 13h 93h 00h 80h DS3234 256 SRAM SRAM CS 00h 2 SPI DS3234 SPI CS SCLK DIN/DOUT 1 CS Low VCC VBAT VPF SPI DS3234 1 RTC