CY8C24123A
CY8C24223A, CY8C24423A
Document Number: 38-12028 Rev. *I Page 28 of 56
DC Analog Reference Specifications
The following tables list the guaranteed maximum and minimum specifications for the voltage and temperature ranges: 4.75V to 5.25V
and -40°C ≤ TA ≤ 85°C, 3.0V to 3.6V and -40°C ≤ TA ≤ 85°C, or 2.4V to 3.0V and -40°C ≤ TA ≤ 85°C, respectively. Typical parameters
apply to 5V, 3.3V, and 2.7V 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.
Note Avoid using P2[4] for digital signaling when using an analog resource that depends on the Analog Reference. Some coupling
of the digital signal may appear on the AGND.
Table 25. 5V DC Analog Reference Specifications
Symbol Description Min Typ Max Units
BG Bandgap Voltage Reference 1.28 1.30 1.33 V
–AGND = Vdd/2 Vdd/2 - 0.04 Vdd/2 - 0.01 Vdd/2 + 0.007 V
–AGND = 2 x BandGap 2 x BG - 0.048 2 x BG - 0.030 2 x BG + 0.024 V
–AGND = P2[4] (P2[4] = Vdd/2) P2[4] - 0.011 P2[4] P2[4] + 0.011 V
–AGND = BandGap BG - 0.009 BG + 0.008 BG + 0.016 V
–AGND = 1.6 x BandGap 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) -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 26. 3.3V DC Analog Reference Specifications
Symbol Description Min Typ Max Units
BG Bandgap Voltage Reference 1.28 1.30 1.33 V
–AGND = Vdd/2 Vdd/2 - 0.03 Vdd/2 - 0.01 Vdd/2 + 0.005 V
–AGND = 2 x BandGap Not Allowed
–AGND = P2[4] (P2[4] = Vdd/2) P2[4] - 0.008 P2[4] + 0.001 P2[4] + 0.009 V
–AGND = BandGap BG - 0.009 BG + 0.005 BG + 0.015 V
–AGND = 1.6 x BandGap 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) -0.034 0.000 0.034 mV
–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
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