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5. FUNCTIONAL DESCRIPTION
5.3 Reference Voltage Circuit
S1F76540 contains a reference voltage circuit for a voltage stabilization circuit (regulator).
The stabilizing potential described in Section 5.4 is defined with the split ratio between the external resistance
and reference voltage values.
The reference voltage allows you to change the temperature coefficient using the TC1 and TC2 pins, and you
can select one of four modes shown in Table 5.2.
Table 5.2 Reference voltage temperature coefficient settings
TC1
Mode
(H=V
)
DD
name
(L=VI)
CT0
H
CT1
H
CT2
L
CT3
L
(Note 1) The reference voltage is based on Ta = 25°C.
(Note 2) The temperature gradient CT is defined in the following expression: In Table 5.2, the negative sign
assigned to CT means that |V
CT =
(Note on switching the TC1 and TC2 pins)
When switching the TC1 and TC2 pins after power-on, be sure to turn the power off (POFF1X=POFF2X=VI).
6
TC2
Reference voltage value V
(H=V
)
DD
(L=VI)
Min.
H
-1.55
L
-1.62
H
-1.65
L
-1.70
| reduces as the temperature rises.
REF
| V
(50°C) | - | V
REF
REF
50°C - 0°C
EPSON
(V)
REF
(Note 1)
Typ.
Max.
-1.5
-1.45
-1.5
-1.38
-1.5
-1.35
-1.5
-1.30
(0°C) |
×
| V
S1F76540M0C Series Technical Manual
Temperature coefficient CT (%/°C)
(Note 2)
Min.
Typ.
-0.07
-0.05
-0.19
-0.15
-0.42
-0.35
-0.65
-0.55
100
(25°C) |
REF
Max.
-0.03
-0.11
-0.28
-0.45
(Rev.1.1)
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