7
FN6775.0
December 8, 2008
SMB Timing Specification VSMB = 2.7V to 5.5V; Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise
specified. Temperature limits established by characterization and are not production tested.
PARAMETERS SYMBOL CONDITIONS MIN TYP MAX UNITS
SMBus Frequency FSMB 10 100 kHz
Bus Free Time TBUF 4.7 µs
Start Condition Hold Time from SCL THD:STA 4 µs
Start Condition Set-up Time from SCL TSU:STA 4.7 µs
Stop Condition Set-up Time from SCL TSU:STO 4 µs
SDA Hold Time from SCL THD:DAT 300 ns
SDA Set-up Time from SCL TSU:DAT 250 ns
SCL Low Period TLOW 4.7 µs
SCL High Period THIGH 4 µs
SMBus Inactivity Time-out Maximum Charging Period Without a SMBus
Write to MaxSystemVoltage or ChargeCurrent
Register
120 180 250 s
NOTE:
3. Limits should be considered typical and are not production tested.
Typical Operating Performance DCIN = 20V, 2S2P Li-Battery, T
A
= +25°C, unless otherwise noted.
FIGURE 3. MAXIMUM SYSTEM VOLTAGE ACCURACY
FIGURE 4. CHARGE CURRENT ACCURACY
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
4.2 6.3 8.4 10.5 12.6 14.7 16.8 18.9
MAX SYSTEM VOLTAGE COMMAND (V)
OUTPUT VOLTAGE ACCURACY (%)
0.5A LOAD
2.0A LOAD
6.0A LOAD
-12
-8
-4
0
4
8
12
0468
CHARGE CURRENT COMMAND (A)
CHARGE CURRENT ACCURACY (%)
2
ISL9518, ISL9518A
