A4059
BATTERY MANAGEMENT
AiT Semiconductor Inc.
www.ait-ic.com
PROGRAMMABLE VOLTAGE AND
CURRENT LINEAR BATTERY MANAGEMENT CHIP
Enable design
By controlling whether the ISET pin resistor connected, users can reach close A4059 function. Figure 1a .
Can also be achieved simultaneously through the TEMP port Close A4059 the function. When the external
battery is not in NTC resistor can be set through the microcontroller TEMP port Wade is 0 to achieve open
A4059, to configure external resistors R1 and R2 to achieve closure A4059.Figure 1b.
Figure 1a
Figure 1b
Figure 1. A4059 Enable Design
Determine the value of R1, R2
The value of R1 and R2 according to battery temperature monitoring range and the thermistor resistance
values to determine, are described as follows: assume that the temperature range of the battery set TL ~ TH,
(TL <TH); batteries used in negative temperature coefficient thermistor (NTC), RTL TL when its temperature
resistance, RTH its resistance when the temperature TH, then the RTL> RTH, then the temperature TL, the
first pin TEMP-side voltage is:
When the temperature reaches TH, the first side of the TEMP pin voltage
is:
then，according to: VTEMPL = VHIGH = K2 x VIN (K2 = 0.6)
VTEMPH=VLOW=K1 x VIN (K1=0.3)
Can solve for:
Similarly, if the battery is the positive temperature coefficient of internal (PTC) thermistor the RTH> RTL, we
can calculate:
REV1.0 - OCT 2013 RELEASED -
- 8 -
AITSEMI [ AiT Semiconductor ]
