Cypress CY8C24994 Manual De Usuario

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. 

BG

Bandgap Voltage Reference

1.28

1.30

1.32

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

[4, 5]

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

1.32

V

–

AGND = Vdd/2

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

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

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