ISL12021 Просмотр технического описания (PDF) - Intersil
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ISL12021 Datasheet PDF : 24 Pages
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ISL12021
I2C Interface Specifications Test Conditions: VDD = +2.7 to +5.5V, Temperature = -20°C to +70°C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
TYP
MIN
(Note 7)
MAX
UNITS NOTES
tR
SDA and SCL Rise Time
From 30% to 70% of VDD.
20 + 0.1 x Cb
tF
SDA and SCL Fall Time
From 70% to 30% of VDD.
20 + 0.1 x Cb
Cb
Capacitive loading of SDA or SCL Total on-chip and off-chip
10
300
ns
300
ns
400
pF
RPU
SDA and SCL Bus Pull-up Resistor Maximum is determined by tR
1
kΩ
Off-chip
and tF.
For Cb = 400pF, max is about
2~2.5kΩ.
For Cb = 40pF, max is about
15~20kΩ
NOTES:
2. Temperature Conversion is inactive below 2.7V VBAT
3. IRQ/FOUT Inactive.
4. VIL = VDD x 0.1, VIH = VDD x 0.9, fSCL = 400kHz
5. VDD > VBAT +VBATHYS
6. Bit BSW = 0 (Standard Mode), VBAT ≥ 1.8V
7. Specified at +25°C.
8. In order to ensure proper timekeeping, the VDD SR- specification must be followed.
9. Parameter is not 100% tested.
10. These are I2C specific parameters and are not tested, however, they are used to set conditions for testing devices to validate specification.
SDA vs SCL Timing
tF
tHIGH
tLOW
tR
SCL
tSU:STA
SDA
(INPUT TIMING)
SDA
(OUTPUT TIMING)
tSU:DAT
tHD:STA
tHD:DAT
tAA
tDH
tSU:STO
tBUF
Symbol Table
WAVEFORM INPUTS
Must be steady
OUTPUTS
Will be steady
May change
from LOW
to HIGH
May change
from HIGH
to LOW
Don’t Care:
Changes Allowed
Will change
from LOW
to HIGH
Will change
from HIGH
to LOW
Changing:
State Not Known
N/A
Center Line is
High Impedance
5
FN6451.0
March 30, 2007
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