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Document Number: 38-12018 Rev. *M Page 26 of 47
10.3.7 DC Analog Reference Specifications
The following tables list guaranteed maximum and minimum specifications for the voltage and temperature ranges: 4.75V to 5.25V
and -40°C ≤ T
A
≤ 85°C, or 3.0V to 3.6V and -40°C ≤ T
A
≤ 85°C, respectively. Typical parameters apply to 5V and 3.3V at 25°C and
are for design guidance only.
The guaranteed specifications are measured through the Analog Continuous Time PSoC blocks. The power levels for AGND refer to
the power of the Analog Continuous Time PSoC block. The power levels for RefHi and RefLo refer to the Analog Reference Control
register. The limits stated for AGND include the offset error of the AGND buffer local to the Analog Continuous Time PSoC block.
Reference control power is high.
Table 10-11. 5V DC Analog Reference Specifications
Symbol Description Min Typ Max Units
BG Bandgap Voltage Reference 1.28 1.30 1.32 V
– AGND = Vdd/2
[4, 5]
Vdd/2 - 0.04 Vdd/2 - 0.01 Vdd/2 + 0.007 V
– AGND = 2 x BandGap
[4, 5]
2 x BG - 0.048 2 x BG - 0.030 2 x BG + 0.024 V
– AGND = P2[4] (P2[4] = Vdd/2)
[4, 5]
P2[4] - 0.011 P2[4] P2[4] + 0.011 V
– AGND = BandGap
[4, 5]
BG - 0.009 BG + 0.008 BG + 0.016 V
– AGND = 1.6 x BandGap
[4, 5]
1.6 x BG - 0.022 1.6 x BG - 0.010 1.6 x BG + 0.018 V
– AGND Block to Block Variation (AGND = Vdd/2)
[4, 5]
-0.034 0.000 0.034 V
– RefHi = Vdd/2 + BandGap Vdd/2 + BG - 0.10 Vdd/2 + BG Vdd/2 + BG + 0.10 V
– RefHi = 3 x BandGap 3 x BG - 0.06 3 x BG 3 x BG + 0.06 V
– RefHi = 2 x BandGap + P2[6] (P2[6] = 1.3V) 2 x BG + P2[6] -
0.113
2 x BG + P2[6] -
0.018
2 x BG + P2[6] +
0.077
V
– RefHi = P2[4] + BandGap (P2[4] = Vdd/2) P2[4] + BG - 0.130 P2[4] + BG - 0.016 P2[4] + BG + 0.098 V
– RefHi = P2[4] + P2[6] (P2[4] = Vdd/2, P2[6] = 1.3V) P2[4] + P2[6] -
0.133
P2[4] + P2[6] -
0.016
P2[4] + P2[6]+
0.100
V
– RefHi = 3.2 x BandGap 3.2 x BG - 0.112 3.2 x BG 3.2 x BG + 0.076 V
– RefLo = Vdd/2 – BandGap Vdd/2 - BG - 0.04 Vdd/2 - BG + 0.024 Vdd/2 - BG + 0.04 V
– RefLo = BandGap BG - 0.06 BG BG + 0.06 V
– RefLo = 2 x BandGap - P2[6] (P2[6] = 1.3V) 2 x BG - P2[6] -
0.084
2 x BG - P2[6] +
0.025
2 x BG - P2[6] +
0.134
V
– RefLo = P2[4] – BandGap (P2[4] = Vdd/2) P2[4] - BG - 0.056 P2[4] - BG + 0.026 P2[4] - BG + 0.107 V
– RefLo = P2[4]-P2[6] (P2[4] = Vdd/2, P2[6] = 1.3V) P2[4] - P2[6] -
0.057
P2[4] - P2[6] +
0.026
P2[4] - P2[6] +
0.110
V
Table 10-12. 3.3V DC Analog Reference Specifications
Symbol Description Min Typ Max Units
BG Bandgap Voltage Reference 1.28 1.30 1.32 V
– AGND = Vdd/2
[4, 5]
Vdd/2 - 0.03 Vdd/2 - 0.01 Vdd/2 + 0.005 V
– AGND = 2 x BandGap
[4, 5]
Not Allowed
– AGND = P2[4] (P2[4] = Vdd/2) P2[4] - 0.008 P2[4] + 0.001 P2[4] + 0.009 V
– AGND = BandGap
[4, 5]
BG - 0.009 BG + 0.005 BG + 0.015 V
– AGND = 1.6 x BandGap
[4, 5]
1.6 x BG - 0.027 1.6 x BG - 0.010 1.6 x BG + 0.018 V
– AGND Column to Column Variation (AGND =
Vdd/2)
[4, 5]
-0.034 0.000 0.034 V
– RefHi = Vdd/2 + BandGap Not Allowed
– RefHi = 3 x BandGap Not Allowed
– RefHi = 2 x BandGap + P2[6] (P2[6] = 0.5V) Not Allowed
– RefHi = P2[4] + BandGap (P2[4] = Vdd/2) Not Allowed
– RefHi = P2[4] + P2[6] (P2[4] = Vdd/2, P2[6] = 0.5V) P2[4] + P2[6] -
0.075
P2[4] + P2[6] -
0.009
P2[4] + P2[6] +
0.057
V
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