Document Number: 001-53754 Rev. *F Page 20 of 50
DC Analog Reference Specifications
Tab le 12 and Table 13 on page 23 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, or 3.0 V to 3.6 V and –40 °C T
A
85 °C, respectively. Typical parameters apply to 5 V
and 3.3 V at 25 °C. These are for design guidance only.
The guaranteed specifications are measured through the analog CT PSoC blocks. The power levels for AGND refer to the power of
the analog CT 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 CT 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 12. 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 + 1.229 V
DD
/2 + 1.290 V
DD
/2 + 1.346 V
V
AGND
AGND V
DD
/2 V
DD
/2 – 0.038 V
DD
/2 V
DD
/2 + 0.040 V
V
REFLO
Ref Low V
DD
/2 – Bandgap V
DD
/2 – 1.356 V
DD
/2 – 1.295 V
DD
/2 – 1.218 V
RefPower = high
Opamp bias = low
V
REFHI
Ref High V
DD
/2 + Bandgap V
DD
/2 + 1.220 V
DD
/2 + 1.292 V
DD
/2 + 1.348 V
V
AGND
AGND V
DD
/2 V
DD
/2 – 0.036 V
DD
/2 V
DD
/2 + 0.036 V
V
REFLO
Ref Low V
DD
/2 – Bandgap V
DD
/2 – 1.357 V
DD
/2 – 1.297 V
DD
/2 – 1.225 V
RefPower = medium
Opamp bias = high
V
REFHI
Ref High V
DD
/2 + Bandgap V
DD
/2 + 1.221 V
DD
/2 + 1.293 V
DD
/2 + 1.351 V
V
AGND
AGND V
DD
/2 V
DD
/2 – 0.036 V
DD
/2 V
DD
/2 + 0.036 V
V
REFLO
Ref Low V
DD
/2 – Bandgap V
DD
/2 – 1.357 V
DD
/2 – 1.298 V
DD
/2 – 1.228 V
RefPower = medium
Opamp bias = low
V
REFHI
Ref High V
DD
/2 + Bandgap V
DD
/2 + 1.219 V
DD
/2 + 1.293 V
DD
/2 + 1.353 V
V
AGND
AGND V
DD
/2 V
DD
/2 – 0.037 V
DD
/2 – 0.001 V
DD
/2 + 0.036 V
V
REFLO
Ref Low V
DD
/2 – Bandgap V
DD
/2 – 1.359 V
DD
/2 – 1.299 V
DD
/2 – 1.229 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] –
0.092
P2[4] + P2[6] –
0.011
P2[4] + P2[6] +
0.064
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] +
0.007
P2[4] – P2[6] +
0.056
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] –
0.078
P2[4] + P2[6] –
0.008
P2[4] + P2[6] +
0.063
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] +
0.004
P2[4] – P2[6] +
0.043
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] –
0.073
P2[4] + P2[6] –
0.006
P2[4] + P2[6] +
0.062
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] –
0.032
P2[4] – P2[6] +
0.003
P2[4] – P2[6] +
0.038
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] –
0.073
P2[4] + P2[6] –
0.006
P2[4] + P2[6] +
0.062
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] –
0.034
P2[4] – P2[6] +
0.002
P2[4] – P2[6] +
0.037
V
(21 Seiten)
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