SH3100 Datasheet, PDF (54/80 Pages) Semtech Corporation – Supervisory IC with I2C Interface and PWM

SH3100
POWER MANAGEMENT
Pad Specifications (continued)
I²C Communication: SCL & SDA
The I²C pads are designed to comply with the 400kHz (Fast) I²C specification. The pads are open drain outputs with
diode protection only to GND. This allows VDD to collapse without affecting the common bus. Input stages include
input hysteresis and glitch filtering to allow handling of noisy inputs. High levels and rise times are set by external
pull-up resistors on SCL and SDA.
Parameter
Maximum operating frequency
Vout Low (Iol = 3 mA, VDD > 2V)
Vout Low (Iol = 3 mA, VDD < 2V)
Vin High
Vin Low
Input hysteresis (VDD > 2 V)
Input hysteresis (VDD < 2 V)
Input glitch rejection
Input leakage
Input capacitance
Output fall time (Load Cb = 10 pF to 400 pF)
Symbol
F_OP
V_OL1
V_OL2
V_IH
V_IL
V_HYS1
V_HYS2
T_SP
I_IN
C_IN
T_F
Min
1
0.7VDD
0.05VDD
0.1VDD
50
-10
20 + 0.1Cb
Max
0.4
0.2VDD
0.3VDD
100
10
10
300
Units
MHz
V
V
V
V
V
V
ns
μA
pF
ns
Multi-Function Output: PWM
Multi mode pad with function determine by operating mode selection. Includes diode protection to VDD and GND.
Mode 1 is a standard digital output powered from VDD. Used for general-purpose PWM drive, fan speed control, or
switching regulation using external switching transistors.
Mode 2 is for bootstrap boost regulation with internal switching. PWM is pulled Low to energize the inductor and then
set High Impedance to allow energy transfer to VDD through the protection diode. Mode 3 is the power output from
the LDO.
Parameter
Vout High (Mode 1, VDD > 3.3 V, Ioh = 4 mA)
Vout Low (Mode 1 or 2, VDD > 3.3 V, Iol = 4 mA)
Vout High (Mode 1, VDD > 1.7 V, Ioh = 1 mA)
Vout Low (Mode 1 or 2, VDD > 1.7 V, Iol = 1 mA)
Pad rise time (Mode 1, 10 pF load)
Pad fall time (Mode 1 or 2, 10 pF load)
LDO output voltage range (Mode 3)
Min
Voh1
Vol1
Voh2
Vol2
Tr
Tf
Vldo
Typ
VDD – 0.4
0
VDD – 0.25
0
3
Max
VDD
0.4
VDD
0.25
10
10
4.5
Units
V
V
V
V
ns
ns
V
© 2006 Semtech Corp.
54
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