Datasheet AD7997, AD7998 (Analog Devices) - 8

AD7997/AD7998 AD7997/AD7998 Limit at TMIN, TMAX Parameter Conditions Min Max Unit Description
t10 Standard mode 300 ns tFDA, fall time of SDA signal Fast mode 20 + 0.1 CB 300 ns High speed mode CB = 100 pF max 10 80 ns CB = 400 pF max 20 160 ns t11 Standard mode 1000 ns tRCL, rise time of SCL signal Fast mode 20 + 0.1 CB 300 ns High speed mode CB = 100 pF max 10 40 ns CB = 400 pF max 20 80 ns t11A Standard mode 1000 ns tRCL1, rise time of SCL signal after a repeated start condition and after an Acknowledge bit Fast mode 20 + 0.1 CB 300 ns High speed mode CB = 100 pF max 10 80 ns CB = 400 pF max 20 160 ns t12 Standard mode 300 ns tFCL, fall time of SCL signal Fast mode 20 + 0.1 CB 300 ns High speed mode CB = 100 pF max 10 40 ns CB = 400 pF max 20 80 ns tSP Fast mode 0 50 ns Pulse width of suppressed spike High speed mode 0 10 ns tPOWER-UP 1 typ µs Power-up time 1 A device must provide a data hold time for SDA in order to bridge the undefined region of the SCL falling edge. 2 For 3 V supplies, the maximum hold time with CB = 100 pF max is 100 ns max.
t11 t12 t2 t6 SCL t6 t t 4 t3 5 t8 t1 t9 t10 SDA t7 P S S P S = START CONDITION P = STOP CONDITION
03473-0-002 Figure 2. Timing Diagram for 2-Wire Serial Interface Rev. 0 | Page 8 of 32 Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS AD7997 SPECIFICATIONS AD7998 SPECIFICATIONS I2C TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND PIN FUNCTION DESCRIPTIONS TERMINOLOGY TYPICAL PERFORMANCE CHARACTERISTICS CIRCUIT INFORMATION CONVERTER OPERATION TYPICAL CONNECTION DIAGRAM ANALOG INPUT INTERNAL REGISTER STRUCTURE ADDRESS POINTER REGISTER CONFIGURATION REGISTER CONVERSION RESULT REGISTER LIMIT REGISTERS DATAHIGH Register CH1/CH2/CH3/CH4 DATALOW Register CH1/CH2/CH3/CH4 Hysteresis Register (CH1/CH2/CH3/CH4) Using the Limit Registers to Store Min/Max Conversion Result ALERT STATUS REGISTER (CH1 TO CH4) CYCLE TIMER REGISTER SAMPLE DELAY AND BIT TRIAL DELAY SERIAL INTERFACE SERIAL BUS ADDRESS WRITING TO THE AD7997/AD7998 WRITING TO THE ADDRESS POINTER REGISTER FOR A SUBSEQUENT REA WRITING A SINGLE BYTE OF DATA TO THE ALERT STATUS REGISTER O WRITING TWO BYTES OF DATA TO A LIMIT, HYSTERESIS, OR CONFIGU READING DATA FROM THE AD7997/AD7998 ALERT/BUSY PIN SMBus ALERT BUSY PLACING THE AD7997-1/AD7998-1 INTOHIGH SPEED MODE THE ADDRESS SELECT (AS) PIN MODES OF OPERATION MODE 1—USING THE PIN MODE 2 – COMMAND MODE MODE 3—AUTOMATIC CYCLE INTERVAL MODE OUTLINE DIMENSIONS ORDERING GUIDE RELATED PARTS IN I2C-COMPATIBLE ADC PRODUCT FAMILY