MAX6790 Maxim Integrated Products, MAX6790 Datasheet - Page 12

• Manufacturer Part Number: MAX6790
• Description: (MAX6782 - MAX6790) Battery Monitors
• Manufacturer: Maxim Integrated Products

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DataSheet
4
The MAX6782–MAX6785 have factory-set hysteresis for
ease of use and reduced external parts count. For
these devices the absolute hysteresis voltage is a per-
centage of the internally generated reference. The
amount depends on the device option. “A” devices
have 0.5% hysteresis, “B” devices have 5% hysteresis,
and “C” devices have 10% hysteresis. Table 2 presents
the threshold voltages for devices with factory-set hys-
teresis. For factory-set hysteresis, connect HADJ_ to
GND.
Low-Power, 1% Accurate, Dual-/Triple-/Quad-Level
Battery Monitors in Small TDFN and TQFN Packages
Figure 5. MAX6789/MAX6790 Timing
Table 2. Typical Falling and Rising
Thresholds for MAX6782–MAX6785
(HADJ_ = GND)
12
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DEVICE
OPTION
.com
CLEAR
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
A
B
C
IN_
OV
OV
HYSTERESIS
PERCENT
MAX6782–MAX6785 Hysteresis
(%)
0.5
10
5
t
PD
THRESHOLD
FALLING
(V
0.6055
0.5781
0.5477
INF
Factory-Set Hysteresis
) (V)
THRESHOLD
(V
RISING
0.6085
0.6085
0.6085
INR
) (V)
The MAX6782–MAX6785 can also be configured for
externally adjustable hysteresis. Connect a resistive
divider from REF to HADJ_ and to GND (Figure 6) to set
the hysteresis voltage. The hysteresis adjustment range
is from 0.4V to V
(V
Adjustment Logic High (V
V
(V
tory-set hysteresis (Figure 4a).
The MAX6786/MAX6787/MAX6788 offer external hystere-
sis control through the resistive divider that monitors bat-
tery voltage. Figure 2 shows the connections for external
hysteresis. See Calculating an External Hysteresis
Resistive Divider (MAX6786/MAX6787/MAX6788) section
for more information.
HADJ_
HALL
HADJ_
MAX6786/MAX6787/MAX6788 Adjustable
), these devices switch back to the internal fac-
is lower than Hysteresis Adjustment Logic Low
) must be set higher than Hysteresis
REF
V
V
Externally Adjusted Hysteresis
TH-
TH+
, and the voltage at HADJ_
HALH
t
) (Figure 4b). Note that if
CLD
Hysteresis