1 of 6 features ? high-speed 12mbps universal serial bus (usb) interface ? supports standard and overdrive 1-wire ? communication ? slew-rate-controlled 1-wire timing and active pullup for improved 1-wire network performance ? ds9490r has an rj11 interface for standard connectivity accessories such as the ds1402d-dr8 ? DS9490B has an i button ? interface and retains a fixed i button ? built-in custom ds2401 identification chip ? reads all 1-wire and ibutton devices. writes all except eprom 1-wire/i button devices applications ? software authorization?protection against software piracy by tying software operation to the presence of i button hardware. ? i button initialization and download? loggers like the thermochron ? can be missioned and downloaded. monetary i buttons can be refilled with money. ? demonstration?demonstrate the features of i buttons or 1-wire chips on personal computers. ? development?aid development of 1-wire applications by providing a pc interface to verify device contents and state. typical operating circuit pc usb DS9490B ibutton pc usb ds9490r ds1402d-dr8 ordering information part description DS9490B# usb single f5 i button holder with protective cap ds9490r# usb to 1-wire rj11 #denotes a rohs-compliant device that may include lead(pb) that is exempt unde r the rohs requirements. packaging/shipping information the part is shipped individually in an anti-static bag. description the DS9490B is a usb bridge a nd holder for a single f5-size i button. the i button is securely held behind a latched door. the ds9490r is a usb bridge with 1-wire rj11 interface to accommodate 1-wire receptacles and networks. the ds1402d-dr8 (blue dot?) can readily be used in conjunction with the ds9490r to create an i button pc reader. both adapters are based on the ds2490 usb to 1-wire bridge chip. pc software drivers for windows ? 98, windows 2000, windows me, and windows xp ? operating systems can be found on the i button website under software support at www.maxim-ic.com/products/ibutton/software/tmex/index.cfm . ds9490r/DS9490B usb to 1-wire/i button adapte r www.maxim-ic.com 1-wire, i button, and thermochron are r egistered trademarks of maxim integrated products, inc. blue dot is a trademark of maxim integrated products, inc. windows and windows xp are registered trademarks of microsoft corp. 19-4881; rev 8/09
ds9490 2 of 6 figure 1. ds9490r figure 2. DS9490B * *note: to eject an i button, insert a straightened paper clip into the side access hole of the DS9490B. push the paper clip in the direction of the i button. a different i button can then be inserted. the data contact faces down and away from the em bossed ?i?. before inserting the paper clip disconnect the DS9490B from the usb bus. each usb bridge contains a unique built-in identifi cation chip. the identification chip is a custom ds2401 that is a 64-bit id number (see figure 3). figure 3. ds2401 id chip 64-bit lasered rom msb lsb 8-bit crc code 12-bit fixed (000h) 36-bit serial number 8-bit family code (81h) msb lsb msb lsb msb lsb msb lsb
ds9490 3 of 6 pin configuration figure 4. 1-wire rj11 socket for ds9490r pin signal name description 1 v dd 5vdc output 2 gnd power ground 3 ow 1-wire data 4 gnd_ow 1-wire return 5 suso usb suspend output 6 n.c. no connection figure 5. i button socket for DS9490B pin signal name description 1 ow 1-wire data 2 gnd_ow 1-wire return 1 2 * *note: the data contact faces down and away from the embossed ?i?. once the i button is inserted in the enclosure, snap the end cap over it. the end cap is removed by depressing the release tab with a paper clip, swinging it fully open, and sliding out the hinge. looking into female rj11 connector 654321
ds9490 4 of 6 mechanical dimensions all dimensions are in millimeters. figure 6. ds9490r 11.66 3.12 20.42 42.65 13.89 21.54 figure 7. DS9490B 3.28 11.66 56.82 24.94 16.54 8.74 environmental requirements condition parameter value storage temperature -10c to +85c storage relative humidity, noncondensing 95% storage duration 1yr (max) at 95%rh and +85 ? c operating temperature 0c to +70c operating relative humidity, noncondensing 80%
ds9490 5 of 6 electrical characteristics parameter specification usb i/f as defined in chapter 7 of the usb specification* 1-wire i/f see the ds2490 data sheet** the ds9490r and DS9490B consume 58ma in usb ac tive mode and 0.5ma in suspend mode*. the ds9490r has the v bus power and ground available on the rj11 c onnector. in active mode the current available to an externally powered fixture is 42m a* (100ma to 58ma); however it is recommended that no more than 25ma be used. an external circuit can detect when the module is in suspend by monitoring the suso signal on pin 5 of the rj11 connector. when this condition is detected, the external circuit must also go into a low power state. note : the suso pin of the ds2490 is an open drain output and requires a pullup resistor to create a valid signal. see the ds2490 data sheet for the conditions where suso is active. revision c of the ds9490r and all revisions of the ds9490r# have suso routed to the rj11 connector. the availability of suso at the rj11 connector is not production tested. therefore, before relying on suso in an application, first verify the pres ence of this signal with the particular adapter. *guaranteed by design, not production tested. **tested at ds2490 component level. figure 8. functional diagram emi filter vbus d- d+ gnd vin vout en n/c gnd lp2980im5-3.3 pmod vd nc nc nc nc nc nc vb x1 suso x0 d- nc d+ vpp nc nc ow nc nc nc gnd nc ds2490 c2 1.0uf emi filter c3 4.7 r2 24 r3 24 r1 1.5k c1 0.1uf ow gnd ds2401 ow gnd ds9503 usb connector c6 33pf c5 33pf x1 12mhz l1 l2 c7 33pf c8 33pf u1 u2 u3 u4 j2 1 2 1 2 j1 1 2 3 4 1 3 4 5 2 1 5 7 8 12 24 19 20 17 10 1 2 3 4 5 6 female rj11 ds9490r DS9490B 1 2 ibutton socket j3 6 5 3 1 r7 10
ds9490 6 of 6 maxim cannot assume responsibility for use of any circuitry other than circuitry ent irely embodied in a maxim product. no circu it patent licenses ar e implied. maxim reserves the right to change t he circuitry and specif ications without not ice at any time. maxim integrated products, 120 san ga briel drive, sunnyvale, ca 94086 408-737-7600 ? 2009 maxim integrated products maxim is a registered trademark of maxim integrated products, inc . revision history revision date description pages changed 8/09 removed references to leaded packages in the ordering information table. 1
|
