CY8C24123A
CY8C24223A
CY8C24423A
Document Number: 38-12028 Rev. *V Page 28 of 71
DC Analog Reference Specifications
The following tables list the guaranteed maximum and minimum specifications for the voltage and temperature ranges: 4.75 V to
5.25 V and –40 °C T
A
85 °C, 3.0 V to 3.6 V and –40 °C T
A
85 °C, or 2.4 V to 3.0 V and –40 °C T
A
85 °C, respectively.
Typical parameters are measured at 5 V, 3.3 V, and 2.7 V at 25 °C and are for design guidance only.
The guaranteed specifications for RefHI and RefLo are measured through the Analog Continuous Time PSoC blocks. The power
levels for RefHi and RefLo refer to the Analog Reference Control register. AGND is measured at P2[4] in AGND bypass mode. Each
Analog Continuous Time PSoC block adds a maximum of 10 mV additional offset error to guaranteed AGND specifications from the
local AGND buffer. Reference control power can be set to medium or high unless otherwise noted.
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 22. 5-V DC Analog Reference Specifications
Reference
ARF_CR
[5:3]
Reference Power
Settings
Symbol Reference Description Min Typ Max Units
0b000 RefPower = high
Opamp bias = high
V
REFHI
Ref High V
DD
/2 + Bandgap V
DD
/2 + 1.136 V
DD
/2 + 1.288 V
DD
/2 + 1.409 V
V
AGND
AGND V
DD
/2 V
DD
/2 – 0.138 V
DD
/2 + 0.003 V
DD
/2 + 0.132 V
V
REFLO
Ref Low V
DD
/2 – Bandgap V
DD
/2 – 1.417 V
DD
/2 – 1.289 V
DD
/2 – 1.154 V
RefPower = high
Opamp bias = low
V
REFHI
Ref High V
DD
/2 + Bandgap V
DD
/2 + 1.202 V
DD
/2 + 1.290 V
DD
/2 + 1.358 V
V
AGND
AGND V
DD
/2 V
DD
/2 – 0.055 V
DD
/2 + 0.001 V
DD
/2 + 0.055 V
V
REFLO
Ref Low V
DD
/2 – Bandgap V
DD
/2 – 1.369 V
DD
/2 – 1.295 V
DD
/2 – 1.218 V
RefPower = medium
Opamp bias = high
V
REFHI
Ref High V
DD
/2 + Bandgap V
DD
/2 + 1.211 V
DD
/2 + 1.292 V
DD
/2 + 1.357 V
V
AGND
AGND V
DD
/2 V
DD
/2 – 0.055 V
DD
/2 V
DD
/2 + 0.052 V
V
REFLO
Ref Low V
DD
/2 – Bandgap V
DD
/2 – 1.368 V
DD
/2 – 1.298 V
DD
/2 – 1.224 V
RefPower = medium
Opamp bias = low
V
REFHI
Ref High V
DD
/2 + Bandgap V
DD
/2 + 1.215 V
DD
/2 + 1.292 V
DD
/2 + 1.353 V
V
AGND
AGND V
DD
/2 V
DD
/2 – 0.040 V
DD
/2 – 0.001 V
DD
/2 + 0.033 V
V
REFLO
Ref Low V
DD
/2 – Bandgap V
DD
/2 – 1.368 V
DD
/2 – 1.299 V
DD
/2 – 1.225 V
0b001 RefPower = high
Opamp bias = high
V
REFHI
Ref High P2[4]+P2[6] (P2[4] =
V
DD
/2, P2[6] = 1.3 V)
P2[4] + P2[6]
– 0.076
P2[4] + P2[6] –
0.021
P2[4] + P2[6] +
0.041
V
V
AGND
AGND P2[4] P2[4] P2[4] P2[4] –
V
REFLO
Ref Low P2[4]–P2[6] (P2[4] =
V
DD
/2, P2[6] = 1.3 V)
P2[4] – P2[6]
– 0.025
P2[4] – P2[6] +
0.011
P2[4] – P2[6] +
0.085
V
RefPower = high
Opamp bias = low
V
REFHI
Ref High P2[4]+P2[6] (P2[4] =
V
DD
/2, P2[6] = 1.3 V)
P2[4] + P2[6]
– 0.069
P2[4] + P2[6] –
0.014
P2[4] + P2[6] +
0.043
V
V
AGND
AGND P2[4] P2[4] P2[4] P2[4] –
V
REFLO
Ref Low P2[4]–P2[6] (P2[4] =
V
DD
/2, P2[6] = 1.3 V)
P2[4] – P2[6]
– 0.029
P2[4] – P2[6] +
0.005
P2[4] – P2[6] +
0.052
V
RefPower = medium
Opamp bias = high
V
REFHI
Ref High P2[4]+P2[6] (P2[4] =
V
DD
/2, P2[6] = 1.3 V)
P2[4] + P2[6]
– 0.072
P2[4] + P2[6] –
0.011
P2[4] + P2[6] +
0.048
V
V
AGND
AGND P2[4] P2[4] P2[4] P2[4] –
V
REFLO
Ref Low P2[4]–P2[6] (P2[4] =
V
DD
/2, P2[6] = 1.3 V)
P2[4] – P2[6]
– 0.031
P2[4] – P2[6] +
0.002
P2[4] – P2[6] +
0.057
V
RefPower = medium
Opamp bias = low
V
REFHI
Ref High P2[4]+P2[6] (P2[4] =
V
DD
/2, P2[6] = 1.3 V)
P2[4] + P2[6]
– 0.070
P2[4] + P2[6] –
0.009
P2[4] + P2[6] +
0.047
V
V
AGND
AGND P2[4] P2[4] P2[4] P2[4] –
V
REFLO
Ref Low P2[4]–P2[6] (P2[4] =
V
DD
/2, P2[6] = 1.3 V)
P2[4] – P2[6]
– 0.033
P2[4] – P2[6] +
0.001
P2[4] – P2[6] +
0.039
V
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