SmartFusion Customizable System-on-Chip (cSoC)
Revision 10 2-77
Programmable Analog Specifications
Current Monitor
Unless otherwise noted, current monitor performance is specified at 25°C with nominal power supply
voltages, with the output measured using the internal voltage reference with the internal ADC in 12-bit
mode and 91 Ksps, after digital compensation. All results are based on averaging over 16 samples.
Table 2-93 • Current Monitor Performance Specification
Specification Test Conditions Min. Typical Max. Units
Input voltage range (for driving ADC
over full range)
0 – 48 0 – 50 1 – 51 mV
Analog gain From the differential voltage across the
input pads to the ADC input
50 V/V
Input referred offset voltage Input referred offset voltage 0 0.1 0.5 mV
–40ºC to +100ºC 0 0.1 0.5 mV
Gain error Slope of BFSL vs. 50 V/V ±0.1 ±0.5 % nom.
–40ºC to +100ºC ±0.5 % nom.
Overall Accuracy Peak error from ideal transfer function,
25°C
±(0.1 +
0.25%)
±(0.4 +
1.5%)
mV plus
%
reading
Input referred noise 0 VDC input (no output averaging) 0.3 0.4 0.5 mVrms
Common-mode rejection ratio 0 V to 12 VDC common-mode voltage –86 –87 dB
Analog settling time To 0.1% of final value (with ADC load)
From CM_STB (High) 5 µs
From ADC_START (High) 5 200 µs
Input capacitance 8pF
Input biased current CM[n] or TM[n] pad,
–40°C to +100°C over maximum input
voltage range (plus is into pad)
Strobe = 0; IBIAS on CM[n] 0 µA
Strobe = 1; IBIAS on CM[n] 1 µA
Strobe = 0; IBIAS on TM[n] 2 µA
Strobe = 1; IBIAS on TM[n] 1 µA
Power supply rejection ratio DC (0 – 10 KHz) 41 42 dB
Incremental operational current
monitor power supply current
requirements (per current monitor
instance, not including ADC or
VAREFx)
VCC33A 150 µA
VCC33AP 140 µA
VCC15A 50 µA
Note: Under no condition should the TM pad ever be greater than 10 mV above the CM pad. This restriction is
applicable only if current monitor is used.
