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PRELIMINARY
PSoC®3: CY8C38 Family Data Sheet
Document Number: 001-11729 Rev. *I
Page 77 of 100
11.5.12 Unity Gain Buffer
The Unity Gain Buffer is created using a SC/CT Analog Block. See the Unity Gain Buffer component data sheet in PSoC Creator for
full AC/DC specifications, and APIs and example code.
11.5.13 Temperature Sensor
11.5.14 LCD Direct Drive
Table 11-37. Unity Gain Buffer DC Specifications
Parameter
Description
Conditions
Min
Typ
Max
Units
Vos
Input offset voltage[9]
--
10
mV
Offset voltage drift
-
-
30
µv/°C
Input voltage range
Vssa
-
Vdda
V
Voh, Vol
Output voltage range
Vssa +
0.15
-
Vdda -
0.15
V
Output current source capability[9]
Drive setting 3, Vdda = 1.71V
-
-
250
µA
Quiescent current
-
900
-
µA
Table 11-38. Unity Gain Buffer AC Specifications
Parameter
Description
Conditions
Min
Typ
Max
Units
Bandwidth[9, 15]
Noninverting mode, 300 mV
≤ Vin ≤
Vdda - 1.2V, Cl
≤ 25 pF
7-
-
MHz
Slew rate[9]
Vdda = 1.71V 5% to 90% FS output,
CL = 50 pF
3-
-
V/µs
Input noise spectral density[9]
-
38
-
nV/sqrtHz
Table 11-39. Temperature Sensor Specifications
Parameter
Description
Conditions
Min
Typ
Max
Units
Temp sensor accuracy
-40 to +140 range
-
±5
-
°C
Table 11-40. LCD Direct Drive DC Specifications
Parameter
Description
Conditions
Min
Typ
Max
Units
Icc
LCD operating current
32x4 segment display at 30 Hz.
Segment capacitance is < 500 pF[18].
-15
-
μA
Vbias
LCD bias range
Vdda must be 3V or higher
2.048
-
5.325
V
LCD bias step size
-
25.8
-
mV
LCD capacitance per
segment/common driver
Drivers may be combined
-
500
5000
pF
Long term segment offset
-
-
10
mV
Iout per segment driver
Strong drive
120
160
200
µA
Weak drive
-
0.5
-
µA
Weak drive 2
-
1
-
µA
Icc per segment driver
Strong drive
220
260
300
µA
Weak drive
-
11
-
µA
Weak drive 2
-
22
-
µA
No drive
-
<25
-
nA
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