PDF《典型工作电路》

1 VIH 0.7 x VCC VCC + 0.3 V Logic

0 VIL -0.3 0.3 x VCC V PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Active Supply Current (I2C Active) ICCA (Note 2)

125 250 ?A Standby Supply Current (I2C Inactive) ICCS (Notes 2, 3)

100 175 ?A Maxim Integrated Products??3 DS3232M ±5ppm、内置SRAM的I2 C实时时钟 DC Electrical Characteristics―General (continued) (VCC = +2.3V to +4.5V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +3.3V, VBAT = +3.0V, and TA?=?+25NC, unless otherwise noted.) (Note 1) DC Electrical Characteristics―VBAT Current Consumption (VCC = 0V, VBAT = +2.3V to +4.5V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = 0V, VBAT = +3.0V, and TA = +25NC, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Temperature Conversion Current (I2C Inactive) ICCSCONV

200 350 ?A Power-Fail Voltage VPF 2.45 2.575 2.70 V Logic

0 Output (32KHZ, INT/SQW, SDA) VOL IOL = 3mA 0.4 V Logic

0 Output (RST) VOL IOL = 1mA 0.4 V Logic

1 Output (32KHZ) VOH Active supply >

3.3V, IOH = -1mA 2.0 V Active supply >

2.7V, IOH = -0.75mA 2.0 Active supply >

2.3V, IOH = -0.14mA 2.0 Output Leakage (32KHZ, INT/SQW, SDA) ILO -0.1 +0.1 ?A Input Leakage (SCL) ILI -0.1 +0.1 ?A RST I/O Leakage IOL -200 +10 ?A VBAT Leakage IBATLKG TA = +25NC -100

25 +100 nA Temperature Accuracy TEMPACC VCC or VBAT = +3.3V Q3 NC Temperature Conversion Time tCONV

10 ms Pushbutton Debounce PBDB

250 ms Reset Active Time tRST

250 ms Oscillator Stop Flag (OSF) Delay tOSF (Note 4)

25 100 ms PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Active Battery Current (I2C Active) IBATA (Note 2)

25 75 ?A Timekeeping Battery Current (I2C Inactive) IBATT EN32KHZ = 0, INTCN =

1 (Note 2) 1.8 3.0 ?A Temperature Conversion Current (I2C Inactive) IBATTC

200 350 ?A Data Retention Current (Oscillator Stopped and I2C Inactive) IBATDR TA = +25NC

100 nA Maxim Integrated Products??4 DS3232M ±5ppm、内置SRAM的I2 C实时时钟 Note 1: Limits are 100% tested at TA = +25°C and TA = +85°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed by design and characterization. Typical values are not guaranteed. Note 2: Includes the temperature conversion current (averaged). Note 3: Does not include RST leakage if VCC <

VPF. Note 4: The parameter tOSF is the period of time the oscillator must be stopped for the OSF flag to be set. Note 5: The state of RST does not affect the I2C interface or RTC functions. Note 6: Interface timing shown is for fast-mode (400kHz) operation. This device is also backward-compatible with standard mode I2C timing. Note 7: CB = total capacitance of one bus line in picofarads. Note 8: Guaranteed by design and not 100% production tested. AC Electrical Characteristics―Power Switch (TA = -40NC to +85NC, unless otherwise noted.) (Note 1, Figure 2) AC Electrical Characteristics―I2C Interface (VCC or VBAT = +2.3V to +4.5V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +3.3V, VBAT = +3.0V, and TA = +25NC, unless otherwise noted.) (Notes 1, 6, Figure 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS VCC Fall Time, VPFMAX to VPFMIN tVCCF

300 Fs VCC Rise Time, VPFMIN to VPFMAX tVCCR

0 Fs Recovery at Power-Up tREC (Note 5)

250 300 ms PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SCL Clock Frequency fSCL

0 400 kHz Bus Free Time Between STOP and START Conditions tBUF 1.3 Fs Hold Time (Repeated) START Condition tHD:STA 0.6 Fs Low Period of SCL tLOW 1.3 Fs High Period of SCL tHIGH 0.6 Fs Data Hold Time tHD:DAT