SI85XX-EVB Silicon Laboratories Inc, SI85XX-EVB Datasheet - Page 11

• Manufacturer Part Number: SI85XX-EVB
• Description: BOARD EVAL CURRENT SENSOR 10A
• Manufacturer: Silicon Laboratories Inc

Specifications of SI85XX-EVB

• Sensor Type: Current Sensor
• Sensing Range: 10A
• Interface: Analog
• Voltage - Supply: 2.7 V ~ 5.5 V
• Embedded: No
• Utilized Ic / Part: Si8512
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sensitivity: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed
• Other names: 336-1425

Integrator reset Option 1 is selected by connecting T
to VDD. In this mode, the Si85xx is held in reset as long
as the signals on R1–R4 satisfy the logic equations of
Table 11. It is typically used in applications where the
gate drivers are external to the system controller IC (the
gate driver delay ensures reset is completed prior to the
start of measurement).
Reset Option 2 is selected by connecting a timing
resistor (R
ground. It is typically used in applications where the
gate drivers are on-board the controller. In this mode,
the on-chip reset timer is triggered when the signals on
R1–R4 satisfy the logic equations in Table 11. Once
triggered, the timer maintains integrator in reset for time
duration t
R
to terminate the reset cycle prior to the start of
measurement under worst-case timing conditions. Note
that values of t
Electrical Specifications" on page 4 results in increased
integrator output offset error and increased output noise
on V
following equation (see Table 9):
where values of R
than 150 ns (R
TRST
Figure 5. Programming Reset Time (t
OUT
Table 9. Typical Reset Time vs. R
. The user must select the value of resistor R
. Moreover, t
R
100 k
2.2 M
TRST
R
15 k
1 M
as programmed by the value of resistor
R
TRST
TRST
TRST
in Figure 5) from the TRST input to
R
TRST
< 15 k) should not be used.
below the specified value in "1.
t
Resistance
R
R
= 10 ns/k
’s time is summarized by the
that produce a reset time less
TRST
Si85xx
Reset Time (t
150 ns
1 µs
9 µs
2 µs
TRST
Preliminary Rev. 0.21
R
R
)
)
TRST
RST
2.4. Total Measurement Error
The Si85xx’s absolute accuracy is affected by the
following factors:



Table 10 includes a composite of all environmental and
operating conditions that can ultimately affect the
absolute measurement accuracy of the Si85xx. The
total worst-case accuracy at full scale can be estimated
by the sum of the initial accuracy (up to ±5%) plus aging
(up to ±1.5%) and supply variations (up to ±3.5%). For
example, the total measurement error expected for a
device operating at a given V
10% if the device is operated over a temperature range
of –40 to 125 °C for up to 10 years. If the temperature
range is limited to 0 to 85 °C, the measurement error
can be improved by up to 2%. See Figure 6 for details.
Table 10. Total Measurement Error Contributors
@ given V
Ambient operating temperature
VDD supply voltage
Time
Temperature variation
Error Contributor
Aging (10 years)
–40 to 125 °C
Initial error
DD
±10%, 25 °C
DD
supply of 5 V (±10%) is
% Error Added
±3.5%
±1.5%
±5%
Si85xx
11