Cypress CY8C24123A 用户手册

Document Number: 38-12028  Rev. *I

Page 28 of 56

The following tables list the guaranteed maximum and minimum specifications for the voltage and temperature ranges: 4.75V to 5.25V
and -40°C 

≤ T

A

 

≤ 85°C, 3.0V to 3.6V and -40°C ≤ T

A

 

≤ 85°C, or 2.4V to 3.0V and -40°C ≤ T

A

 

≤ 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.

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

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