december 2011 doc id 18463 rev 1 1/10 UM1054 user manual steval-isb013v1 demonstration board based on the stc3105 battery monitor ic with alarm ou tput for gas gauge applications introduction this user manual describes the steval-isb013v1, a demonstration board specifically designed for the stc3105 battery monitor ic. the document provides: a brief description of the stc3105 device a description of the demonstration board a detailed bill of materials for the demonstration board the layout of the demonstration board figure 1. steval-isb013v1 demonstration board www.st.com
contents UM1054 2/10 doc id 18463 rev 1 contents 1 stc3105 overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 demonstration board description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 demonstration board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 demonstration board connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
UM1054 stc3105 overview doc id 18463 rev 1 3/10 1 stc3105 overview the stc3105 monitors the voltage and current of the battery and includes a coulomb counter to keep track of the charge/discharge status. an alarm output signals a low state- of-charge (soc) condition and/or a low battery voltage. in addition, a relaxation register starts to count when the gas gauge is in a specified light-load condition, indicating when an ocv (open circuit voltage) measurement should be made for soc correction. features of the stc3105 include: accurate battery voltage measurement coulomb counter to keep track of the battery's soc internal 32.768 khz time base low-battery alarm output with programmable soc and voltage thresholds relaxation timer to track the load condition (user programmable load current threshold) i 2 c interface for battery monitoring and device control performance criteria of the device are: 0.5% battery voltage accuracy 1% coulomb counter accuracy using an external sensing resistor low power consumption: 100 a in active operating conditions, 50 a in power saving operating conditions, 2 a in standby mode and 1 a in power-down mode the device is packaged in a tdfn8, 3 mm x 2 mm x 0.75 mm (pitch 0.65 mm) (as used in the demonstration board). figure 2. typical application diagram for the stc3105 gnd s da s cl alm vcc vin cg s tc 3 105 b a ttery rcg u c with g as g au ge firmw a re i 2 c bus b a ttery s t a te-of-ch a rge b a ttery d a t a 8 0 % rem a ining percent a ge rem a ining time 2:06 0. 3 2 a c u rrent 3 .71 v volt a ge am045051v1
demonstration board description UM1054 4/10 doc id 18463 rev 1 2 demonstration board description the steval-isb013v1 is a demonstration board designed to help the user evaluate the performance of the stc3105. figure 3. demonstration board schematic 1. pull-up resistors are not mounted on the board. the us er must either mount them on the board to pull up to v cc or pull up externally. table 1. bill of materials reference part/value footprint description u1 stc3105 tdfn8 3 mm x 2 mm battery monitoring inte grated circuit from stmicroelectronics r1 0 0402 strap r2 0 0402 isolate current to gnd plane. not necessary on the user?s pcb. rcg 20 m / 1% 0805 shunt resistor rup1 4.7 k / 5% 0402 pull-up resistor is not mounted on the board (option for onboard pull-up to v cc ). rup2 4.7 k / 5% 0402 pull-up resistor is not mounted on the board (option for onboard pull-up to v cc ). rup3 4.7 k / 5% 0402 pull-up resistor is not mounted on the board (option for onboard pull-up to v cc ). c1 1 f / 16 v / x7r 0402 optional filtering capacitor c2 1 f / 10 v / x7r 0402 decoupling capacitor alm sda scl gnd vin vcc nc cg c1 1uf c2 1uf r1 0 rcg 20m r2 0 rup1 (1) 4.7k rup2 (1) 4.7k rup3 (1) 4. 7 k gnd scl sda alm vcc cg- cg+ vcc vin u1 stc3105 am045052v1
UM1054 demonstration board layout doc id 18463 rev 1 5/10 3 demonstration board layout the printed circuit board of the demonstration board has the following characteristics: board dimensions: 23 mm x 18 mm 2-layer pcb thickness of pcb: 1.5 mm fr4 material thickness of copper: 35 m figure 4. top view of demonstration board am04505 3 v1
demonstration board layout UM1054 6/10 doc id 18463 rev 1 figure 5. bottom view of demonstration board am045054v1
UM1054 demonstration board connections doc id 18463 rev 1 7/10 4 demonstration board connections the stc3105 demonstration board can be simply connected to a battery and interfaced with a digital controller as shown in figure 6 . figure 6. demonstration board connections with battery and microcontroller 1. the alm, sda, and scl pins are pulled up to vcc through 4.7 k resistors. in order to pull up these pins to external i/o voltage, the onboard pull-up resistors should be removed. io volt a ge = 1. 8 v (or 2. 8 v, 3 . 3 v...) (1) 4.7 k 4.7 k s da s cl i 2 c m as ter am045055v1 alm 4.7 k
ordering information UM1054 8/10 doc id 18463 rev 1 5 ordering information the steval-isb013v1 demonstration board can be ordered online at www.st.com (order code steval-isb013v1).
UM1054 revision history doc id 18463 rev 1 9/10 6 revision history table 2. document revision history date revision changes 05-dec-2011 1 initial release.
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