SI8513-C-IS Datasheet, PDF (17/37 Pages) List of Unclassifed Manufacturers – Si85XX UNIDIRECTIONAL AC CURRENT SENSORS

Si85xx
As explained in Section “2.3. Integrator Reset and Current Measurement”, the signals applied to R1–R4 can
control integrator reset in real time (Option 1), or they can trigger a reset event of programmable duration (Option
2). Referring to Figure 14, reset timing is exclusively a function of the signals applied to R1–R4 when TRST is tied
to VDD.
If not connected to VDD, the reset timer is enabled, and TRST must be connected through a resistor to ground to
set the reset duration (t_R). Note that the reset timer is retriggerable and generates a timed integrator discharge
pulse whenever the reset logic output transitions from low to high.
R1
R2
R3
R4
MODE = 1
R4 = 0
MODE = 1
R4 = 1
Output 1
TRST = VDD
Reset timing determined
only by inputs R1–R4.
TRST = R1 to GND
Reset triggered by inputs
R1–R4. Reset time (tR) set
by value of resistor RTRST.
Output 2
RESET
TIMER
PGM
CLK ^OUT
TRST
MODE = 0
Output 3
10
+
VREF
SYSTEM
CONTROLLER
Logic level gate
control signals
(to Rn inputs)
Internal
Driver
Required if driver
output voltage > VDD
External
Driver
Logic level gate
control signals
(to Rn inputs)
INTEGRATOR
Figure 14. Si851x Integrator Reset Logic
Preliminary Rev. 0.4
17